Rainbow Electronics AT75C320 User Manual
Page 4
4
AT75C320
1769A–07/01
USART A
RXDA
I
Receive Serial Data
TXDA
O
Transmit Serial Data
NRTSA
O
Request to Send
NCTSA
I
Clear To Send
NDTRA
O
Data Terminal Ready
NDSRA
I
Data Set Ready
NDCDA
I
Data Carrier Detect
NRIA
I
Ring Indicator
SCKA
I/O
Serial Clock
USART B
RXDB
I
Receive Serial Data
TXDB
O
Transmit Serial Data
JTAG Interface
NTRST
I
TAP Reset
TCK
I
TAP Clock
TMS
I
JTAG Test Mode Select
TDI
I
JTAG Test Data Input
TDO
O
JTAG Test Data Output
Codec Interface A
SCLKA
I/O
Codec Serial Clock
FAS
I/O
Frame Pulse
STXA
O
Transmit Data to Codec
SRXA
I
Receive Data from Codec
Codec Interface B
SCLKB
I/O
Codec Serial Clock
FSB
I/O
Frame Pulse
STXB
O
Transmit Data to Codec
SRXB
I
Receive Data from Codec
Miscellaneous
RESET
I
Master Reset
FIQ/LOWP
I
Fast Interrupt/Low Power
IRQ0
I
External Interrupt request
XREF
I
External 96 MHz PLL Reference
XTALIN
I
External Crystal Input
XTALOUT
O
External Crystal Output
TST
I
Test Mode
DBW32
I
External Data Width for CS0
BO206
I
Package Size Option
Table 2. AT75C320 Pin Description (Continued)
Block
PQFP Pin Name
Type
Function