Fujitsu MHV2040AH 用户手册
Interface
5-152
C141-E217
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)
(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)
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)
(*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)
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)
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)
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)
(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)
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
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
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)
STOP during a data in burst)