Motorola MSC8101 ADS User's Guide Page 269

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Programming Sheets
MSC8101 User’s Guide A-15
SCY1 SCY2
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
AM16 CSNT ACS0 ACS1 SCY3SCY0AM9 AM10 AM14
0123456789101112131415
AM0 AM3 AM4 AM5 AM6 AM7 AM15AM13AM11AM8AM2AM1 AM12
BCTLD
MEMORY CONTROLLER
OR[0–7, 10, 11]
Option Register
Address: OR0 (0x10104), OR1 (0x1010C), OR2 (0x10114),
OR3 (0x1011C), OR4 (0x10124), OR5 (0x1012C), OR6 (0x10134),
OR7 (0x1013C), OR10 (0x10154), OR11 (0x1015C)
Reset: 0–15 1111_1110_0000_0000,
TRLX – Timing Relaxed, Bit 29
GPCM Mode
*
= Reserved. Write to 0 for future compatibility
*
0
*
0
*
0
SETA TRLX
EHTR0
1 Corresponding address bits are used in comparison with
0 Corresponding address bits are masked
AM[0–16] – Address Mask, Bits 0–16
address pins. Address mask bits can be set or cleared
in any order in the field
1BCTLx is not asserted upon access to the memory bank
0BCTLx is asserted upon access to the memory bank
BCTLD – Data Buffer Control Disable, Bit 19
10
Four idle clock cycles are inserted (default)
11 Eight idle clock cycles are inserted
EHTR[0–1] – Extended Hold Time on Read Accesses, Bits 30–31
01
00
One idle clock cycle is inserted
No additional cycles are inserted, normal timing generated
10
CS
is output a quarter of a clock after the address lines
11 CS
is output half a clock after the address lines
ACS[0–1] – Address to Chip-Select Setup, Bits 21–22
01
00
Reserved
CS
is output at the same time as the address lines
1CS/PWE is deasserted a quarter of a clock earlier
0CS/PWE is deasserted normally
CSNT – Chip-Select Negation Time, Bit 20
1111 15 clock cycles wait states
0000 0 clock cycle wait states
SCY[0–3] – Cycle Length in Clocks, Bits 24–27
1PSDVAL is generated after external logic asserts GTA
0
PSDVAL generated internally unless GTA is asserted externally
SETA – External Access Termination, Bit 28
EHTR1
16–31 0000_1110_1111_0100
Read/Write
• • • • • •
OR/GPCM
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