CS62180B datasheet(8/50 Pages) CIRRUS

8 / 50 page

HOST MODE

Serial Interface

For applications in which the device is to interface

with a host processor, the CS62180B can

be configured to run in host modeby tying the

Serial Port Select pin (SPS) to the +5V supply

(VDD). This allows access to the serial port,

providing a large number of configuration options

via the 16 on-chip control and status registers.

Serial read/write timing, controlled by SCLK, is

entirely independent of the transmit and receive

timing. This allows the host microcontroller to

monitor the status register and counters, modify

configuration options, and issue commands asyn-

chronously with the T1 system. A serial timing

overview is provided in Figure 1.

All data transfers are initiated by setting Chip Se-

lect (CS) low. Any read or write to the serial port is

initiated by writing an 8-bit command word. The

command word consists of 4 separate fields (see

Figure 2). When reading from the port, data is out-

put on the falling edge of SCLK, and held until the

next falling edge.

All data is written to and read from the port LSB

first. When writing to the port, SDI input data is

sampled on the rising edge of SCLK.

D0 (LSB) is the R/W field, and specifies whether

the current operation is to be a read or a write: 1 =

read, 0 = write. The second 4 bits (D1 - D4) con-

tain the address field. Written LSB first, they

specify which of the sixteen registers to access. D5

(Device Select) should be set to zero when address-

ing the CS62180B. However, if the CS62180B

shares the same serial interface lines with a

Cirrus TI Line Interface (see Figure 3), D5 will be

set to a "1" when addressing the Line Interface device.

The CS62180B will ignore any read/write

commandswith a "1" in D5,

allowing both parts to share CS.

D6 is reserved, and must be set to 0 for normal

operation.

(MSB)

654321

(LSB)

ADD3

ADD2

ADD1

ADD0

R/W

Individual

Set to "0"

CS62180B

(MSB)

(LSB)

0Write

Burst

Crystal

LIU

Read

Figure 2. Address Command Byte (ACB)

R/W

ADD0 ADD1 ADD2 ADD3

SCLK

SDO

SDI

Write Address Command Byte (ACB)

Read or Write Register Data

Figure 1. Serial Read/Write Timing

CS62180B

DS225PP2

CS62180B Datasheet(PDF) 8 Page - Cirrus Logic

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