5.6 Timing
C141-E218 5-153 Table 5.29 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
tLI 0 150 0 150 0 150 0 100 0 100 0 75 Limited interlock time (*1)
tMLI 20 20 20 20 20 20 Interlock time with minimum (*1)
TUI 0 0 0 0 0 0 Unlimited interlock time (*1)
tAZ 10 10 10 10 10 10 Maximum time allowed for output
drivers to release (from asserted or
negated)
tZAH 20 20 20 20 20 20 Minimum delay time required for
output
tZAD 0 0 0 0 0 0 Drivers to assert or negate (from
released)
tENV 20 70 20 70 20 70 20 55 20 55 20 50 Envelope time (from DM ACK- to
STOP and HDMARDY- during
data in burst initiation and from
DMACK to STOP during data out
burst initiation)
tRFS 75 70 60 60 60 50 Ready-to-final-STROBE time (no
STROBE edges shall be sent this
long after negation of DMARDY-)
tRP 160 125 100 100 100 85 Ready-to-pause time (that
recipient shall wait to pause after
negating DMARDY-)
tIORDYZ 20 20 20 20 20 20 Maximum time before releasing
IORDY
tZIORDY 0 0 0 0 0 0 Minimum time before driving
IORDY (*4)
tACK 20 20 20 20 20 20 Setup and hold times for
DMACK- (before assertion or
negation)
tSS 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 tMLI that apply to host signals only, the parameters tUI, tMLI and tLI 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. tUI is an unlimited interlock that has no maximum time value. tMLI is a limited time-out that has a defined minimum. tLI
is a limited time-out that has a defined maximum.
*2: 80-conductor cabling shall be required in order to meet setup (tDS, tCS) and hold (tDH, tCH) times in modes greater than 2.
*3: Timing for tDVS, tDVH, tCVS and tCVH 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 tZIORDY may be greater than tENV 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 tDS, and tDH 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.