Fujitsu MHU2100AT, Руководство по эксплуатации продукта

Страница: 225 / 278

5.6 Timing
C141-E202-01EN 5-149
5.6.3.2 Ultra DMA data burst timing requirements
Table 5.29 Ultra DMA data burst timing requirements (1 of 2)
NAME MODE 0
(in ns)
MODE 1
(in ns)
MODE 2
(in ns)
MODE 3
(in ns)
MODE 4
(in ns)
MODE 5
(in ns)
COMMENT
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
t
2CYCTYP
240 160 120 90 60 40 Typical sustained average two
cycle time
t
CYC
112 73 54 39 25 16.8 Cycle time allowing for
asymmetry and clock variations
(from STROBE edge to STROBE
edge)
t
2CYC
230 153 115 86 57 38 Two cycle time allowing for
clock variations (from rising edge
to next rising edge or from falling
edge to next falling edge of
STROBE)
t
DS
15 10 7 7 5 4 Data setup time at recipient (from
data valid until STROBE edge)
(*2), (*5)
t
DH
5 5 5 5 5 4.6 Data hold time at recipient (from
STROBE edge until data may
become invalid) (*2), (*5)
t
DVS
70 48 31 20 6.7 4.8 Data valid setup time at sender
(from data valid until STROBE
edge) (*3)
t
DVH
6.2 6.2 6.2 6.2 6.2 4.8 Data valid hold time at sender
(from STROBE edge until data
may become invalid) (*3)
t
CS
15 10 7 7 5 5 CRC word setup time at device
(*2)
t
CH
5 5 5 5 5 5 CRC word hold time device (*2)
t
CVS
70 48 31 20 6.7 10 CRC word valid setup time at
host (from CRC valid until
DMACK-negation) (*3)
t
CVH
6.2 6.2 6.2 6.2 6.2 10 CRC word valid hold time at
sender (from DMACK-negation
until CRC may become invalid)
(*3)
t
ZFS
0 0 0 0 0 35 Time from STROBE output
released-to-driving until the first
transition of critical timing
t
DZFS
70 48 31 20 6.7 25 Time from data output released-
to-driving until the first transition
of critical timing
t
FS
230 200 170 130 120 90 First STROBE time (for device to
first negate DSTROBE from
STOP during a data in burst)