DIT4096 datasheet(11/25 Pages) TI2

11 / 25 page

DIT4096

SBOS225A

www.ti.com

READ OPERATION

Figure 7 shows an illustration of the read operation for the

control port. You may read one register or buffer address at

a time, or use the auto-increment capability built into the

control port to perform block reads. A 16-bit header is first

written to the port, with the first byte being used to configure

control port operation and set the starting register or buffer

address. The second byte of the header is comprised of

“don’t care” bits, which can be set to either 0 or 1 without

affecting port operation.

The first byte of the header contains two control bits, R/W

and STEP, followed by a 6-bit address. For read operations,

R/W = 1. The STEP bit determines the address step size for

the auto-increment operation. When STEP = 0, the address

is incremented by 1. When STEP = 1, the address is

incremented by 2. Incrementing by 1 is useful when reading

multiple control registers in sequence, or when reading both

left and right channel status data in sequence. Incrementing

by 2 is useful for reading just one channel of status data in

sequence.

The first output data byte occurs immediately after the 16-bit

header has been written. This byte contains the 8-bit data for

the register or buffer address pointed to by the first byte of

the header. To read a single address location, CS is brought

high after the least significant bit of the first data byte is

clocked out of the port. For auto increment mode, CS is kept

low to read successive register or buffer addresses.

Byte 0

Byte 1

Byte N

Header

Set CS = 1 here to read one register or buffer location.

Keep CS = 0 to enable auto-increment mode.

CDIN

CDOUT

CCLK

R/W STEP

A5A4

A3A2

MSB

LSB

BYTE 0:

BYTE DEFINITION

Auto-Increment Address Step Size: 0 = Increment Address by 1

1 = Increment Address by 2

Read/Write Control: Set to 1 for Read Operation

Byte 1: All 8 bits are Don’t Care. Set 0 or 1.

Bytes 2 through N: 8-Bit Register or Buffer data.

High Impedance

Byte 0

Byte 1

Ignore Until Next High-to-Low Transition of CS

FIGURE 7. Read Operation Format.

FIGURE 8. Serial Port Timing.

CSCR

SDS

SDH

CFDO

CSZ

CFCS

CCLK

CDIN

CDOUT

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