XRT83SL34 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83SL34' PDF : 80 Pages View PDF
XRT83SL34
QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. P1.0.8
PRELIMINARY
MOTOROLA ASYCHRONOUS INTERFACE TIMING
The signals used in the Motorola microprocessor interface mode are: Address Strobe (AS), Data Strobe (DS),
Read/Write Enable (R/W), Chip Select (CS), Address and Data bits. The interface is compatible with the timing
of a Motorola 68000 microprocessor family with up to 16.67 MHz clock frequency. The interface timing is
shown in Figure 29 and Figure 30. The I/O specifications are shown in Table 50.
FIGURE 29. MOTOROLA 68K ASYNCHRONOUS PROGRAMMED I/O INTERFACE TIMING
ALE_AS
A D D R [6 :0 ]
CS
D A T A [7 :0 ]
RD_DS
W R_R/W
RDY_DTACK
t0
t3
t1
READ OPERATION
Valid Address
Valid Data for Readback
t2
t0
t3
t1
W RITE OPERATION
Va lid Ad dress
Data Available to W rite Into the LIU
t2
TABLE 50: ASYNCHRONOUS - MOTOROLA 68K - INTERFACE TIMING SPECIFICATION
SYMBOL
PARAMETER
MIN
MAX
t0
Valid Address to CS Falling Edge
t1
CS Falling Edge to DS Assert
t2
DS Assert to DTACK Assert
NA
DS Pulse Width (t2)
0
-
65
-
-
50
50
-
t3
CS Falling Edge to AS Falling Edge
0
-
Reset pulse width - both Motorola and Intel Operations (see Figure 30)
t9
Reset pulse width
30
UNITS
ns
ns
ns
ns
ns
FIGURE 30. MICROPROCESSOR INTERFACE TIMING - RESET PULSE WIDTH
t
9
Reset
75
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