82801DB Datasheet, PDF (543/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Electrical Characteristics
Figure 17-11. Ultra ATA Mode (Pausing a DMA Burst)
t90
STOP (host)
DMARDY#
t99
STROBE
DATA
Figure 17-12. Ultra ATA Mode (Terminating a DMA Burst)
DMARQ
(drive)
t87
DMACK# (host)
t99c
STOP
(host)
DMARDY#
(drive)
t87
Strobe
(host)
DATA
(host)
Figure 17-13. USB Rise and Fall Times
t88
t91
t99a
t91
t92 t93
CRC
Rise Time
Fall Time
C_L
Differential
Data Lines
10%
90%
90%
10%
C_L
tR
tF
Low Speed: 75 ns at C_L = 50 pF, 300 ns at C_L = 350 pF
Full Speed: 4 to 20 ns at C_L = 50 pF
High
Speed:
0.8
to
1.2
ns
at
C
L
=
10
pF
Intel^® 82801DB ICH4 Datasheet
543