XRT83L34
xr
REV. 1.0.1
QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
93
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. The interface timing is shown in
Figure 35 and
Figure 36. The I/O
FIGURE 35. MOTOROLA 68K ASYNCHRONOUS PROGRAMMED I/O INTERFACE TIMING
TABLE 51: ASYNCHRONOUS - MOTOROLA 68K - INTERFACE TIMING SPECIFICATION
SYMBOL
PARAMETER
MIN
MAX
UNITS
t0
Valid Address to CS Falling Edge
0
-
ns
t1
CS Falling Edge to DS Assert
65
-
ns
t2
DS Assert to DTACK Assert
-
50
ns
NA
DS Pulse Width (t2)
50
-
ns
t3
CS Falling Edge to AS Falling Edge
0
-
ns
Reset pulse width - both Motorola and Intel Operations (see
t9
Reset pulse width
30
FIGURE 36. MICROPROCESSOR INTERFACE TIMING - RESET PULSE WIDTH
CS
A D D R [6:0 ]
D A T A [7:0]
RD_DS
WR _R /W
R D Y_DT AC K
V a lid D ata fo r R eadb ack
D ata A va ilable to W rite In to the LIU
READ O P E RAT IO N
W RIT E O P E RAT IO N
t
0
t
0
t
1
t
2
Valid Addres s
Valid Address
t
3
t
3
t
1
t
2
A LE_AS
Reset
t
9