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MIU

Packaged DRAM config

• For i3 this is encoded into the efuse area
• For m5 there is a register in the gpio block that read to work out which tables to use.

For SSC8336N the value is 0xf

dig registers

Analog

offset	name	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	notes
0x4	clk waveforms	DQS_WAVEFORM[7]	DQS_WAVEFORM[6]	DQS_WAVEFORM[5]	DQS_WAVEFORM[4]	DQS_WAVEFORM[3]	DQS_WAVEFORM[2]	DQS_WAVEFORM[1]	DQS_WAVEFORM[0]	CKO_STATE[7]	CKO_STATE[6]	CKO_STATE[5]	CKO_STATE[4]	CKO_STATE[3]	CKO_STATE[2]	CKO_STATE[1]	CKO_STATE[0]	8x mode - 0xAA 4x mode - 0xCC
0x8	reserved
0x14	rd_phase_timing
0x1c	dqsm something
0x5c	reserved
0x70	clock phase
0x74	clock phase
0x78	dqs waveform?
0x7c	skew?
0x90	???
0x94	???
0x98	???
0x9c	???
0xa0	???
0xa4	????
0xd8	???
0xdc	???
0xe8	recv trigger level
0xec	recv trigger level

Digital

For i3, i2m, p3 this is at 0x1f202400

offset	name	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	default value
0x0	config0	init done	single command done	enter self refresh	enter deep power down	rasz	casz	wez	issue single command			turn off auto refresh	turn on odt	dram reset	enable cs	enable cke	auto initial dram cycle	p3 - 8004
0x4	config1	cko en	address en	dq enable	cke enable			data ratio	data ratio	columns	columns	banks	banks	bus width	bus width	dram type	dram type
								0x0 - 1x		0x0 - 8		0x0 - 2		0x0 - 16 bit		0x0 - SDR
								0x1 - 2x		0x1 - 9		0x1 - 4		0x1 - 32 bit		0x1 - DDR
								0x2 - 4x		0x2 - 10		0x2 - 8		0x2 - 64bit		0x2 - DDR2
								0x3 - 8x								0x3 - DDR3
0x14				TRC timing	TRC timing	TRC timing	TRC timing	TRC timing	TRC timing	TRTP timing	TRTP timing	TRTP timing	TRTP timing	TRRD timing	TRRD timing	TRRD timing	TRRD timing
0x3c	sw_rst									g3_rst	g2_rst	g1_rst	g0_rst				miu_rst

IPL DDR2 init cycle

• clear config0
• delay
• set dram cs and reset in config0
• delay
• enable cke in config0
• delay
• turn on odt and trigger initial cycle in config0
• big delay

/*
 * MSC313 MIU (memory interface unit?) - multiport ddr controller
 *
 * The product brief for the msc313e that is available
 * doesn't detail any of the registers for this but it
 * seems to match the MIU in another MStar chip called
 * the MSB2521 that does have a leaked datasheet available.
 * That said I can't be 100% sure that all the bits in the
 * registers match what is actually in the msc313 so I'll
 * document anything that matches and not just paste the
 * whole lot here. TL;DR; there be gaps.
 *
 * 0x1f202000?
 * In the MSB2521 datasheet this is called MIU_ATOP, miu analog?
 *
 * 0x004 -
 *    15 - 8    |    7 - 0
 * dqs waveform | clock waveform
 * 0xaa - x8?   | 0xaa - x8?
 * 0xcc - x4?   | 0xcc - x4?
 *
 * 0x1f202400
 * In the MSB2521 datasheet this is called MIU_DIG, miu digital?
 *
 * 0x008 - config2
 * |   4 - 0
 * | rd timing
 * | 0xD
 *
 * 0x00c - config3
 *
 * 0x010 - config4
 *
 *    15   |    14    | 13 - 8 |    7 - 4  |   3 - 0
 * trp[4]  |  trcd[4] |  trs   |  trp[3:0] | trcd[3:0]
 *    0    |     0    |  0x1e  |  0x9      | 0x9
 *
 * 0x018 - config6
 * 15 - 12 | 11 - 8 | 7 - 4 | 3 - 0
 *  trtw   |  twtr  |  twr  |  twl
 *
 * 0x01c - config7
 *
 *    15  | 14   | 12 | 11 - 8 | 7 - 0
 * twr[4] | tccd |  txp   | trfc
 *
 * The vendor suspend code writes 0xFFFF to all of these
 * but the first where it writes 0xFFFE instead
 * Presumably this is to stop requests happening while it
 * is putting the memory into low power mode.
 *
 * 0x08c - group 0 request mask
 * 0x0cc - group 1 request mask
 * 0x10c - group 2 request mask
 * 0x14c - group 3 request mask
 *
 * 0x180 - protection 0 start
 * 0x184 - protection 0 end
 * 0x188 - protection 1 start
 * 0x18c - protection 1 end
 * 0x190 - protection 2 start
 * 0x194 - protection 2 end
 * 0x198 - protection 3 start
 * 0x19c - protection 3 end
 * 0x1a0 - protection msb 0 - 3
 * 0x1a4 - protection en / ddr size
 * top bits ddr size?
 * bottom bits protect 0 - 3 en
 * 0x1b4 - protection fault address low
 * 0x1b8 - protection fault address high
 * 0x1bc - protection fault status
 * 14 - 8    | 7 - 5  | 4         | 1        | 0
 * client id | hit no | hit flag? | int mask | clr
 *
 * 0x1f202200
 * This isn't in the MSB2521 datasheet but it looks like a bunch
 * more group registers.
 *
 * The vendor pm code writes 0xFFFF these before messing with
 * the DDR right after the 4 group registers above. Hence my guess
 * is that these are a bunch of strapped on groups.
 *
 * 0x00c - group 4 request mask?
 * 0x04c - group 5 request mask?
 */

Reg dumps

M5 after IPL

DDR PLL?

1f206200: 0000 0000 0000 0000 0100 0000 0216 0000    ................
1f206210: 0010 0000 0000 0000 0000 0000 0000 0000    ................

ANA

1f202000: 0001 0000 aaaa 0000 0000 0000 0000 0000    ................
1f202010: 003f 0000 0000 0000 0000 0000 0085 0000    ?...............
1f202020: 0000 0000 0000 0000 0e00 0000 0200 0000    ................
1f202030: 0000 0000 8020 0000 0020 0000 6005 0000    .... ... ....`..
1f202040: 4820 0000 0004 0000 0000 0000 0000 0000     H..............
1f202050: 8000 0000 0000 0000 0114 0000 2222 0000    ............""..
1f202060: 8000 0000 0029 0000 2004 0000 0400 0000    ....).... ......
1f202070: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202080: 0000 0000 0000 0000 0000 0000 0800 0000    ................
1f202090: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2020a0: 0000 0000 0000 0000 4000 0000 1f1f 0000    .........@......
1f2020b0: 1f1f 0000 0000 0000 0000 0000 0010 0000    ................
1f2020c0: 33c8 0000 007f 0000 f000 0000 003b 0000    .3..........;...
1f2020d0: 2020 0000 2020 0000 0707 0000 0707 0000      ..  ..........
1f2020e0: 0800 0000 8801 0000 0202 0000 0707 0000    ................
1f2020f0: 0001 0000 0000 0000 0000 0000 0000 0000    ................
1f202100: 0000 0000 0000 0000 0000 0000 0008 0000    ................
1f202110: 0000 0000 0001 0000 0000 0000 0000 0000    ................
1f202120: f0f3 0000 0000 0000 2829 0000 0000 0000    ........)(......
1f202130: 0000 0000 0000 0000 ff00 0000 007f 0000    ................
1f202140: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202150: 0000 0000 0000 0000 0000 0000 0202 0000    ................
1f202160: 3800 0000 0000 0000 0000 0000 0000 0000    .8..............
1f202170: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202180: 001f 0000 0000 0000 0000 0000 0000 0000    ................
1f202190: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2021a0: 0000 0000 0200 0000 8600 0000 0000 0000    ................
1f2021b0: 0700 0000 0000 0000 0002 0000 0000 0000    ................
1f2021c0: 0011 0000 0000 0000 0010 0000 1111 0000    ................
1f2021d0: 1111 0000 1111 0000 1111 0000 1111 0000    ................
1f2021e0: 3333 0000 0033 0000 0000 0000 0000 0000    33..3...........
1f2021f0: 0000 0000 0000 0000 0000 0000 0000 0000    ................

Extra

1f202200: 00fe 0000 0320 0000 0000 0000 00fe 0000    .... ...........
1f202210: 0808 0000 00ff 0000 1f0f 0000 3f2f 0000    ............/?..
1f202220: aaab 0000 0000 0000 0000 0000 0000 0000    ................
1f202230: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202240: 2020 0000 2020 0000 2020 0000 2020 0000      ..  ..  ..  ..
1f202250: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202260: aaab 0000 0000 0000 0000 0000 0000 0000    ................
1f202270: 4007 0000 ffff 0000 0000 0000 0000 0000    .@..............
1f202280: 0000 0000 0000 0000 0300 0000 0000 0000    ................
1f202290: 0000 0000 0000 0000 ffff 0000 ffff 0000    ................
1f2022a0: 00ff 0000 003f 0000 0000 0000 0000 0000    ....?...........
1f2022b0: 0000 0000 0000 0000 1000 0000 0000 0000    ................
1f2022c0: 0000 0000 0000 0000 0000 0000 0030 0000    ............0...
1f2022d0: 0000 0000 0000 0000 0000 0000 ffff 0000    ................
1f2022e0: 0000 0000 2000 0000 0242 0000 0000 0000    ..... ..B.......
1f2022f0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202300: 0000 0000 0606 0000 0000 0000 0000 0000    ................
1f202310: 0000 0000 0000 0000 0000 0000 707c 0000    ............|p..
1f202320: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202330: 0000 0000 0000 0000 60ff 0000 001f 0000    .........`......
1f202340: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202350: 0925 0000 8009 0000 0b0b 0000 0b0b 0000    %...............
1f202360: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202370: 0000 0000 0000 0000 0000 0000 07ff 0000    ................
1f202380: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202390: 0000 0000 0000 0000 8321 0000 0000 0000    ........!.......
1f2023a0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2023b0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2023c0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2023d0: 00f8 0000 0000 0000 0000 0000 0000 0000    ................
1f2023e0: 0000 0000 7170 0000 0000 0000 0000 0000    ....pq..........
1f2023f0: 0000 0000 1074 0000 0000 0000 0000 0000    ....t...........

DIG

1f202400: 801f 0000 0392 0000 000d 0000 1828 0000    ............(...
1f202410: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202420: 0003 0000 4004 0000 8000 0000 c000 0000    .....@..........
1f202430: 0000 0000 0000 0000 0000 0000 8008 0000    ................
1f202440: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202450: 0020 0000 0000 0000 8221 0000 0000 0000     .......!.......
1f202460: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202470: 0000 0000 0000 0000 0000 0000 00f0 0000    ................
1f202480: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202490: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2024a0: 0000 0000 0303 0000 0000 0000 0000 0000    ................
1f2024b0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2024c0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2024d0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2024e0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2024f0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202500: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202510: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202520: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202530: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202540: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202550: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202560: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202570: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202580: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f202590: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2025a0: 0000 0000 6000 0000 00c0 0000 0200 0000    .....`..........
1f2025b0: 0000 0000 0000 0000 0210 0000 39f0 0000    .............9..
1f2025c0: 0000 0000 0000 0000 0008 0000 0000 0000    ................
1f2025d0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2025e0: 0000 0000 0000 0000 0000 0000 0000 0000    ................
1f2025f0: 0000 0000 0000 0000 61a1 0000 8000 0000    .........a......

i3 after IPL

DDR PLL?

1f206200: 0000 0000 0000 0000 0000 0000 022c 0000    ............,...
1f206210: 8010 0000 0000 0000 0000 0000 0000 0000    ................

M5 Register layout

The i3 and m5 layous seem to differ a lot. The M5 IPL uses a bunch of tables to work out where stuff is.

Offsets from 0x1f00000

offset	name	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0x202004	dunno
0x202008	dunno
0x20201C	dunno
0x202044	dunno
0x202048	dunno
0x202058	dunno
0x202060	dunno
0x202064	dunno
0x202068	dunno
0x20206C	dunno
0x20207C	dunno
0x2020BC	dunno
0x2020C0	dunno
0x2020C4	dunno
0x2020C8	dunno
0x2020E0	dunno
0x2020F0	dunno
0x202114	dunno
0x202130	dunno
0x202134	dunno
0x20216C	dunno
0x202120	dunno
0x2022C0	dunno
0x2022C4	dunno
0x2022C8	dunno
0x2022CC	dunno
0x202404	dunno
0x202408	dunno
0x20240C	dunno
0x202420	dunno
0x202424	dunno
0x202428	dunno
0x20242C	dunno
0x202450	dunno
0x20243C	sw rst
0x2025F8	dunno
0x202644	dunno
0x202680	dunno
0x202684	dunno
0x202688	dunno
0x20268C	dunno
0x202690	dunno
0x202694	dunno
0x202698	dunno
0x20269C	dunno
0x2026A0	dunno
0x2026A4	dunno
0x2026A8	dunno
0x202700	dunno
0x20270C	dunno
0x202714	dunno
0x2027BC	dunno
0x2027FC	dunno
0x202C0C	group 0 mask
0x202C60	dunno
0x202C8C	group 1 mask
0x202CE0	dunno
0x202D0C	group 2 mask
0x202D60	dunno
0x202D8C	group 3 mask
0x202DE0	dunno
0x202E0C	group 4 mask
0x202E60	dunno
0x202E8C	group 5 mask
0x202EE0	dunno
0x202F0C	group 6 mask
0x202F60	dunno
0x2023CC	group 7 mask?

i2m

i2m has a bonus thing called MMU. No idea what it does.

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