CS7666 datasheet(20/42 Pages) CIRRUS

20 / 42 page

CS7666

DS302PP1

SAA8574 and a CS495X series part are present, the

CS495X series part I/O port value will be used. A

set of shunts or DIP switches attached to the I/O

port provides a convenient way to select up to 8

configurations. The SKIP command is executed by

writing a 1 to bit 1 of the EEPROM Control register

(42h).

The JUMP is similar to the SKIP command. The

user loads a jump address into the Jump Control

registers (40h and 41h) and then executes the

JUMP command by setting bit 2 of the EEPROM

Control register (42h) to a 1. The jump command

may be used to reduce the amount of required EE-

PROM space by allowing multiple configurations

to share common data. For example, three configu-

rations may be necessary to adjust for three differ-

ent CCD timings, but they may all share a common

gamma table.

The HALT command is used to stop the execution

of the boot state machine. When all necessary data

has been read from the EEPROM, writing a 1 to bit

0 (HALT) of the EEPROM Control register will

safely stop the boot process.

The total number of packets that may be stored in

the external EEPROM is 2k/3 or 682 3-byte com-

mands. Gamma table packets contain 259bytes.

A typical map of the EPROM table is shown in Fig-

ure 8. The only exception to this organization is

data for the CS7666 gamma table. The data for the

gamma table is organized as shown in Figure 9.

Reserved Registers and Test Pins

To ensure proper operation of the CS7666, connect

SCANMODE

(pin 53)

and

SCANENABLE

(pin 64) to ground, and connect TESTPINB

(pin 60) and TRANSP (pin 61) to VDD. Registers

23h - 26h must be set to a value of FFh after reset.

All other reserved registers may be left in their de-

fault states.

CS7666 station address[7] +W

1Ah (addrs of low byte Count)

count value

CS7666 station address[7] +W

1Bh (addrs of high byte Count)

count value

Dest. station address + W

Dest. device address

data value

Dest. station address + W

EPROM Block 000 (binary)

Address 00h

Figure 8. Map of EPROM table for initialization

of registers

CS7666 station address[7] +W

0Ch (gamma reg. addrs)

data = select RGB ram

data [gamma loc 00h]

data [gamma loc 01h]

data [gamma loc FFh]

Figure 9. Map of EPROM table for storing gamma

ram initialization data.

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