CS61535A datasheet(19/48 Pages) CIRRUS

19 / 48 page

impedance state either after bit D7 is output or at

the end of the hold period of data bit D7.

An address/command byte, shown in Table 7,

precedes a data register. The first bit of the ad-

dress/command byte determines whether a read

or a write is requested. The next six bits contain

the address. The CS61535A responds to address

16 (0010000). The last bit is ignored.

The data register, shown in Table 8, can be writ-

ten to the serial port. Data is input on the eight

clock cycles immediately following the ad-

dress/command byte. Bits 0 and 1 are used to

clear an interrupt issued from the INT pin, which

occurs in response to a loss of signal or a problem

with the output driver. If bits 0 or 1 are true, the

corresponding interrupt is suppressed. So if a loss

of signal interrupt is cleared by writing a 1 to bit

0, the interrupt will be reenabled by writing a 0 to

bit 0. This holds for DPM as well.

Writing a "1" to either "Clear LOS" or "Clear

DPM" over the serial interface has three effects:

1) the current interrupt on the serial interface

will be cleared. (Note that simply reading the

2) output data bits 5, 6 and 7 will be reset as

appropriate,

3) future interrupts for the corresponding LOS

or DPM will be prevented from occuring).

Writing a "0" to either "Clear LOS" or "Clear

DPM" enables the corresponding interrupt for

LOS or DPM.

Output data from the serial interface is presented

as shown in Tables 9 and 10. Bits 2, 3 and 4 can

be read to verify line length selection. Bits 5, 6

and 7 must be decoded. Codes 101, 110 and 111

(bits 5, 6 and 7) indicate LOS and DPM state

changes. Writing a "1" to the "Clear LOS" and/or

"Clear DPM" bits in the register also resets status

bits 5, 6, and 7.

SDO goes to a high impedance state when not in

use. SDO and SDI may be tied together in appli-

cations where the host proc esso r has a

bidirectional I/O port.

LSB: first bit in

clr LOS Clear Loss of Signal

1 clr DPM Clear Driver Performance Monitor

LEN0

Bit 0 - Line Length Select

LEN1

Bit 1 - Line Length Select

LEN2

Bit 2 - Line Lenght Select

5 RLOOP Remote Loopback

LLOOP Local Loopback

MSB: last bit in

TAOS

Transmit All Ones Select

Table 8. Input Data Register

LSB: first bit in

LOS

Loss of Signal

DPM

Driver Performance Monitor

LEN0

Bit 0 - Line Length Select

LEN1

Bit 1 - Line Length Select

LEN2

Bit 2 - Line Lenght Select

Table 9. Output Data Bits 0 - 4

Bits

Status

56 7

000 Reset has occurred or no program input.

001 TAOS in effect.

010 LLOOP in effect.

011 TAOS/LLOOP in effect.

100 RLOOP in effect

101 DPM changed state since last "clear DPM"

occured.

110 LOS changed state since last "clear LOS"

occured.

111 LOS and DPM have changed state since

last "clear LOS" and "clear DPM".

Table 10. Coding for Serial Output Bits 5, 6, 7

CS61535A

DS40F2

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