CS7410

30

DS553PP1

1. Optional pull up or pull down resistor may be connected to configure internal ROM program

2. Required external resistor required to select processor boot from internal ROM (pull down) or external

ROM (pull up).

3. Drives for a short time after reset, then reverts to high impedance

4.2

Miscellaneous Pins

receiver interface. The main system clock can be derived from an external crystal connected between the

XTLCLK_I and XTLCLK_O pins, or can be received from the CD servo chip via the XTLCLK_I pin. The

CS7410 can accommodate a variety of input frequencies, such as 44.1 KHz x 256, x 384, or x 512.

4.3

Serial Interface Pins

with different protocols. The 2-wire serial port (SER1) supports industry standard protocols. This port is typ-

ically used for debug, with the CS7410 as the slave. The slave chip select address is programmable, and

defaults to a 7-bit value of 0x1B. A second serial controller (SER2) supports industry standard 3-wire and

4-wire protocols. In master mode, this interface can control a front panel or a small non-volatile memory. In

slave mode, it can operate under control of an external processor, for example, in a combination unit. The

third serial port (SER3) is a 5-wire master device optimized for reading CD subcodes from the servo chip,

and can also be used a general-purpose serial port.

98

GPIO_1

B4

I

GPIO[1]

B

PWM_Out

O

99

GPIO_2

B4

I

GPIO[2]

B

100

GPIO_3

B4

I

GPIO[3]

B

Pin

Name

Type

Reset

Function #1

Dir

Function #2

Dir

Note

Table 7. Pin Assignments (Continued)

Pin

Signal Name

Type

Description

17

XTLCLK_O

O

Crystal output

18

XTLCLK_I

I

Crystal input, or oscillator input

90

RST_N

I

Asynchronous reset input, active low

91

TEST

I

Manufacturing test, tie to ground

Table 8. Miscellaneous Interface Pins

Pin

Signal Name

Type

Description

60

SER1_CLK

B

Debug port serial clock

61

SER1_DAT

B

Debug port serial data

65

SER2_CLK

B

Clock for 4-wire serial port (output for master mode, input

for slave mode)

66

SER2_DI

I

Input data for 4-wire serial port

67

SER2_DO

B

Output data for 4-wire serial port – may function as bidi-

rectional data in 3-wire mode.

Table 9. Serial Interface Pins