Intel B940 Datasheet Page 91

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Datasheet, Volume 2 91
Processor Configuration Registers
2.8.33 C1CKECTRL—Channel 1 CKE Control Register
This register provides Channel 1 CKE Control.
B/D/F/Type: 0/0/0/MCHBAR
Address Offset: 660–663h
Reset Value: 0000_0800h
Access: RW, RW-L, RO
Bit Attr
Reset
Value
Description
31:28 RO 0h Reserved
27 RW 0b
start the self-refresh exit sequence (sd1_cr_srcstart)
This bit indicates the request to start the self-refresh exit sequence.
26:24 RW 000b
CKE pulse width requirement in high phase
(sd1_cr_cke_pw_hl_safe)
This field indicates CKE pulse width requirement in high phase. The field
corresponds to tCKE (high) in the DDR specification.
23 RW-L 0b
Rank 3 Population (sd1_cr_rankpop3)
1 = Rank 3 populated
0 = Rank 3 not populated.
This register is locked by ME pre-allocated Memory lock.
22 RW-L 0b
Rank 2 Population (sd1_cr_rankpop2)
1 = Rank 2 populated
0 = Rank 2 not populated
This register is locked by ME pre-allocated Memory lock.
21 RW-L 0b
Rank 1 Population (sd1_cr_rankpop1)
1 = Rank 1 populated
0 = Rank 1 not populated
This register is locked by ME pre-allocated Memory lock.
20 RW-L 0b
Rank 0 Population (sd1_cr_rankpop0)
1 = Rank 0 populated
0 = Rank 0 not populated
This register is locked by ME pre-allocated Memory lock.
19:17 RW 000b
CKE pulse width requirement in low phase (sd1_cr_cke_pw_lh_safe)
This field indicates CKE pulse width requirement in low phase. The field
corresponds to tCKE (low) in the DDR Specification.
16:14 RO 000b Reserved
13:10 RW 0010b
Minimum Powerdown Exit to Non-Read command spacing
(sd1_cr_txp)
This field indicates the minimum number of clocks to wait following assertion
of CKE before issuing a non-read command.
1010-1111 = Reserved
0010-1001 = 2-9 clocks
0000-0001 = Reserved.
9:1 RW
00000000
0b
Self refresh exit count (sd1_cr_slfrfsh_exit_cnt)
This field indicates the Self refresh exit count. (Program to 255). This field
corresponds to tXSNR/tXSRD in the DDR specification.
0RW 0b
This bit indicates only 1 DIMM populated (sd1_cr_singledimmpop)
This configuration register indicates that only 1 DIMM is populated.
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