XRT83L38 Datasheet, PDF (86/91 Pages) Exar Corporation – OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83L38
OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.0
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 31 and Figure 32. The I/O specifications are shown in Table 52.
FIGURE 31. 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 52: 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
-
20
-
-
135
135
-
t₃
CS Falling Edge to AS Falling Edge
0
-
Reset pulse width - both Motorola and Intel Operations (see Figure 32)
t₉
Reset pulse width
30
UNITS
ns
ns
ns
ns
ns
FIGURE 32. MICROPROCESSOR INTERFACE TIMING - RESET PULSE WIDTH
t
9
Reset
82