Comment t – FUJITSU MHR2030AT User Manual
Page 205
5.6 Timing
C141-E145-02EN
5-131
Table 5.18 Ultra DMA data burst timing requirements (2 of 2)
MODE 0
(in ns)
MODE 1
(in ns)
MODE 2
(in ns)
MODE 3
(in ns)
MODE 4
(in ns)
MODE 5
(in ns)
NAME
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX MIN MAX
MIN
MAX
COMMENT
t
LI
0
150
0
150
0
150
0
100
0
100
0
75
Limited interlock time (*1)
t
MLI
20
20
20
20
20
20
Interlock time with minimum (*1)
T
UI
0
0
0
0
0
0
Unlimited interlock time (*1)
t
AZ
10
10
10
10
10
10
Maximum time allowed for output
drivers to release (from asserted or
negated)
t
ZAH
20
20
20
20
20
20
Minimum delay time required for
output
t
ZAD
0
0
0
0
0
0
Drivers to assert or negate (from
released)
t
ENV
20
70
20
70
20
70
20
55
20
55
20
50
Envelope time (from DMACK- to
STOP and HDMARDY- during
data in burst initiation and from
DMACK to STOP during data out
burst initiation)
t
RFS
75
70
60
60
60
50
Ready-to-final-STROBE time (no
STROBE edges shall be sent this
long after negation of DMARDY-)
t
RP
160
125
100
100
100
85
Ready-to-pause time (that
recipient shall wait to pause after
negating DMARDY-)
t
IORDYZ
20
20
20
20
20
20
Maximum time before releasing
IORDY
t
ZIORDY
0
0
0
0
0
0
Minimum time before driving
IORDY (*4)
t
ACK
20
20
20
20
20
20
Setup and hold times for
DMACK- (before assertion or
negation)
t
SS
50
50
50
50
50
50
Time from STROBE edge to
negation of DMARQ or assertion
of STOP (when sender terminates
a burst)
*1: Except for some instances of t
MLI
that apply to host signals only, the parameters t
UI,
t
MLI
and t
LI
indicate sender-to-recipient or recipient-
to-sender interlocks, i.e., one agent (either sender or recipient) is waiting for the other agent to respond with a signal before
proceeding. t
UI
is an unlimited interlock that has no maximum time value. t
MLI
is a limited time-out that has a defined minimum. t
LI
is a limited time-out that has a defined maximum.
*2: 80-conductor cabling shall be required in order to meet setup (t
DS
, t
CS
) and hold (t
DH
, t
CH
) times in modes greater than 2.
*3: Timing for t
DVS
, t
DVH
, t
CVS
and t
CVH
shall be met for lumped capacitive loads of 15 and 40 pf at the connector where all signals (Data and
STROBE) have the same capacitive load value. Due to reflections on the cable, the measurement of these timings is not valid in a
normally functioning system.
*4: For all modes the parameter t
ZIORDY
may be greater than t
ENV
due to the fact that the host has a pull up on IORDY- giving it a known
state when not actively driven.
*5: The parameters t
DS
, and t
DH
for mode 5 is defined for a recipient at the end of the cable only in a configuration with one device at the
end of the cable.
Note:
All timing measurement switching points (low to high and high to low) shall be taken at 1.5V.