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C141-E090-01EN5 - 88
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