Intel B940 Datasheet Page 88

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Processor Configuration Registers
88 Datasheet, Volume 2
2.8.28 C1WRDATACTRL—Channel 1 Write Data Control Register
This register provides Channel 1 Write Data Control.
2.8.29 C1CYCTRKPCHG—Channel 1 CYCTRK PCHG Register
This register provides Channel 1 CYCTRK Precharge control.
B/D/F/Type: 0/0/0/MCHBAR
Address Offset: 64D–64Fh
Reset Value: 004111h
Access: RW
BIOS Optimal Reset Value 00h
Bit Attr
Reset
Value
Description
23:16 RW 00h Reserved
15 RW 0b Reserved
14:0 RW 4110h
Reserved (sd1_cr_wrblk_wriodlldur)
There is a legacy signal connected to this register that attaches to logic, but
the output of that logic does not connect to any functionality.
B/D/F/Type: 0/0/0/MCHBAR
Address Offset: 650–651h
Reset Value: 0000h
Access: RW, RO
Bit Attr
Reset
Value
Description
15:11 RO 00000b Reserved
10:6 RW 00000b
Write To PRE Delayed (C1sd_cr_wr_pchg)
This field indicates the minimum allowed spacing (in DRAM clocks) between
the WRITE and PRE commands to the same rank-bank This field corresponds
to tWR in the DDR Specification.
5:2 RW 0000b
READ To PRE Delayed (C1sd_cr_rd_pchg)
This field indicates the minimum allowed spacing (in DRAM clocks) between
the READ and PRE commands to the same rank-bank.
1:0 RW 00b
PRE To PRE Delayed (C1sd_cr_pchg_pchg)
This field indicates the minimum allowed spacing (in DRAM clocks) between
two PRE commands to the same rank.
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