XRT79L73 Datasheet, PDF (49/71 Pages) Exar Corporation – 3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
FIGURE 3. ASYNCHRONUS MODE 1 - INTEL TYPE PROGRAMMED I/O TIMING (READ CYCLE)
CS
ALE_AS
A[14:0]
D[7:0]
RD_DS
WR_R/W
RDY_DTACK
t₀
Address
t₅
t₁
Data
t₆
t₂
t₇
XRT79L73
REV. P1.0.0
NOTE: The values for "t0" through "t7", in this figure can be found in Table 2.
TABLE 2: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE
INTEL ASYNCHRONOUS MODE
Test Conditions: TA = 25°C, VCC = 3.3V±5% and 2.5V±5%, unless otherwise specified.
TIMING
DESCRIPTION
MIN.
TYP.
MAX.
t0
Address setup time to pALE low
4
-
-
t1
Address hold time from pALE low
4
-
-
t2
pRD_L, pWR_L pulse width
320
-
-
t3
Data setup time to pWR_L low
0
-
-
t4
Data hold time from pWR_L high
0
-
-
t5
pALE low to pRD_L, pWR_L low
5
-
-
t6
Data invalid from pRD_L high
4
-
-
t7
Data valid from pRDY_L low
-
-
0
t8
pRDY inactive from pRD_L inactive
3
9
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