2 ultra dma data burst timing requirements – FUJITSU MPD3XXXAT User Manual
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5.6.3.2 Ultra DMA data burst timing requirements
Table 5.16 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)
COMMENT
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
(see Notes 1 and 2)
t
2CYCTYP
240
160
120
90
60
Typical sustained average two cycle
time
t
CYC
112
73
54
39
25
Cycle time allowing for asymmetry
and clock variations (from STROBE
edge to STROBE edge)
t
2CYC
230
154
115
86
57
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
Data setup time (at recipient)
(see Note 4)
t
DH
5
5
5
5
5
Data hold time (at recipient)
(see Note 4)
t
DVS
70
48
30
20
6
Data valid setup time at sender (from
data valid until STROBE edge)
(see Note 5)
t
DVH
6
6
6
6
6
Data valid hold time at sender (from
STROBE edge until data may
become invalid) (see Note 5)
t
FS
0
230
0
200
0
170
0
130
0
120
First STROBE time (for device to
first negate DSTROBE from STOP
during a data in burst)
t
LI
0
150
0
150
0
150
0
100
0
100
Limited interlock time (see Note 3)
t
MLI
20
20
20
20
20
Interlock time with minimum
(see Note 3)
t
UI
0
0
0
0
0
Unlimited interlock time (see Note 3)
t
AZ
10
10
10
10
10
Maximum time allowed for output
drivers to release (from asserted or
negated)
t
ZAH
20
20
20
20
20
Minimum delay time required for
output
t
ZAD
0
0
0
0
0
Drivers to assert or negate (from
released)
t
ENV
20
70
20
70
20
70
20
55
20
55
Envelope time (from DMACK- to
STOP and HDMARDY- during data
in burst initiation and from DMACK
to STOP during data out burst
initiation)
t
SR
50
30
20
NA
NA
STROBE-to-DMARDY-time (if
DMARDY- is negated before this long
after STROBE edge, the recipient shall
receive no more than one additional
data word)
t
RFS
75
70
60
60
60
Ready-to-final-STROBE time (no
STROBE edges shall be sent this
long after negation of DMARDY-)
t
RP
160
125
100
100
100
Ready-to-pause time (that recipient
shall wait to pause after negating
DMARDY-)
t
IORDYZ
20
20
20
20
20
Maximum time before releasing
IORDY