XRT83SL34 datasheet(78/80 Pages) EXAR

78 / 80 page

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

TABLE 50: 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

DS Pulse Width (t2)

CS Falling Edge to AS Falling Edge

Reset pulse width - both Motorola and Intel Operations (see

Figure 30)

Reset pulse width

FIGURE 30. MICROPROCESSOR INTERFACE TIMING - RESET PULSE WIDTH

A DDR[6:0 ]

DA T A [7 :0 ]

RD_ DS

WR _ R /W

RD Y _ DTA C K

V a lid D a ta fo r Re adbac k

Data A v ailable to W rite In to the LIU

RE AD O PER ATIO N

W RITE O P ERA TIO N

Va lid Ad d re ss

AL E_ AS

Reset

XRT83SL34 Datasheet(PDF) 78 Page - Exar Corporation