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- 534 -
10.4.2 Program I/O Read Timing
Transfer mode
Symbol Meaning 0 1 2 3 4
t
ASE
Address Setup to -DIOR Low (min.) 70 50 30 30 25
t
DAC
Data Valid from -DIOR Low (max.)
t
RE
-DIOR Pulse Width (min.) 165 125 100 80 70
t
RDSE
-DIOR data setup (min.) 50 35 20 20 20
t
DOH
Data Hold from -DIOR High (min.) 5 5 5 5 5
t
HDTS
Data Tri-state from -DIOR High (max.) 30 30 30 30 30
t
AHE
ADDR Hold from -DIOR High (min.) 20 15 10 10 10
t
RDR
-DIOR Inactive (min.) - - - 70 25
t
RDCY
Read Cycle Time (min.) 600 383 240 180 120
t
CICSV
-IOCS16 valid from -CS (max.) 90 50 40 n/a* n/a*
t
AICSV
-IOCS16 valid from address (max.) 90 50 40 n/a* n/a*
t
AICSI
-IOCS16 inactive from address (max.) 60 45 30 n/a* n/a*
t
RD
Read Data Valid to IORDY (min.) 0 0 0 0 0
t
A
IORDY Setup time (max.) 35 35 35 35 35
t
B
IORDY Pulse Width (max.) 1250 1250 1250 1250 1250
(
*
) -IOCS16 is specified in ATA-2 specifications. For other modes, this signal is invalid. Drive releases
-IOCS16 within the time of t
AICSI
, but how long it takes to turn to inactive condition is defined by pull up
resistance, output impedance and line capacitance.
t
ASE
t
AHE
t
AICSI
t
A
t
B
t
AICSV
t
CICSV
t
RDSE
t
DOH
t
RDCY
t
RDR
t
RE
DA2, DA1, DA0
-CS0, -CS1
-DIOR
DD15∼DD0
-IOCS16
IORDY
t
HDTS
t
DAC
t
RD