XRT83SL38IB datasheet(85/88 Pages) EXAR

85 / 88 page

XRT83SL38

REV. 1.0.2

OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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 28 and Figure 29. The I/O specifications are shown in Table 52.

FIGURE 28. MOTOROLA 68K ASYNCHRONOUS PROGRAMMED I/O INTERFACE TIMING

TABLE 52: ASYNCHRONOUS - MOTOROLA 68K - INTERFACE TIMING SPECIFICATION

SYMBOL

PARAMETER

MIN

MAX

UNITS

Valid Address to CS Falling Edge

CS Falling Edge to DS Assert

DS Assert to DTACK Assert

135

DS Pulse Width (t2)

135

CS Falling Edge to AS Falling Edge

Reset pulse width - both Motorola and Intel Operations (see

Figure 29)

Reset pulse width

µs

FIGURE 29. MICROPROCESSOR INTERFACE TIMING - RESET PULSE WIDTH

ADD R[6:0]

DATA[7:0]

RD_D S

WR _R /W

RD Y_D TACK

Valid Data for Readback

Data Available to W rite Into the LIU

RE AD OP E RATION

W RITE O PE RATION

Valid Address

Valid Addres s

A LE_AS

Reset

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