82801DB Datasheet, PDF (541/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Electrical Characteristics
Figure 17-7. IDE PIO Mode
CLK66
DIOx#
DD[15:0] Write
DD[15:0] Read
IORDY
DA[2:0], CS1#, CS3#
Figure 17-8. IDE Multiword DMA
CLK66
t67
DDREQ[1:0]
DDACK[1:0]
t65
t60
DIOx#
DD[15:0] Read
DD[15:0] Write
t61
t60
t76
t75
t69
write data
t71
t70
read data
t73
t72
sample point
t74
t62,t63
t69
t64
t68
t61
t75
t76
t70 t71
Read Data
t69
t69
Write Data
Read Data
Write Data
Intel^® 82801DB ICH4 Datasheet
541