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2.5” Solid State Disk
Transcend Information Inc.
V1.09
Ultra DMA data burst timing descriptions
Name Comment
t
2CYCTYP
Typical sustained average two cycle time
t
CYC
Cycle time allowing for asymmetry and clock variations (from STROBE edge to STROBE edge)
t
2CYC
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
Data setup time at recipient (from data valid until STROBE edge)
t
DH
Data hold time at recipient (from STROBE edge until data may become invalid)
t
DVS
Data valid setup time at sender (from data valid until STROBE edge)
t
DVH
Data valid hold time at sender (from STROBE edge until data may become invalid)
t
CS
CRC word setup time at device
t
CH
CRC word hold time device
t
CVS
CRC word valid setup time at host (from CRC valid until DMACK- negation)
t
CVH
CRC word valid hold time at sender (from DMACK- negation until CRC may become invalid)
t
ZFS
Time from STROBE output released-to-driving until the first transition of critical timing.
t
DZFS
Time from data output released-to-driving until the first transition of critical timing.
t
FS
First STROBE time (for device to first negate DSTROBE from STOP during a data in burst)
t
LI
Limited interlock time
t
MLI
Interlock time with minimum
t
UI
Unlimited interlock time
t
AZ
Maximum time allowed for output drivers to release (from asserted or negated)
t
ZAH
Minimum delay time required for output
t
ZAD
drivers to assert or negate (from released)
t
ENV
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
Ready-to-final-STROBE time (no STROBE edges shall be sent this long after negation of DMARDY-)
t
RP
Ready-to-pause time (that recipient shall wait to pause after negating DMARDY-)
t
IORDYZ
Maximum time before releasing IORDY
t
ZIORDY
Minimum time before driving IORDY
t
ACK
Setup and hold times for DMACK- (before assertion or negation)
t
SS
Time from STROBE edge to negation of DMARQ or assertion of STOP (when sender terminates a burst)