System Signals - Cirrus Logic CobraNet Silicon Series Hardware User Manual

4.2.7 System Signals

Use these CS181xx signals in the manner strictly described in the CS181xx reference
design. Each signal is briefly described below.
Signal
VCXO_CTRL
MCLK_SEL
DBDA, DBCK
TEST
DATA[15:0]
ADDR[19:0]
WE
CS1
CS2
OE
IOWAIT
GPIO[2:0]
XTI
XTO
XTAL_OUT
FILT2, FILT1
DAO_MCLK
HS[3:0]
DS651UM21
Version 2.1
Description
A Delta-sigma DAC Output for Controlling the On-board VCXO
Control Signal for Selecting MCLK Sources
I2C Debugger Interface
Used for testing during manufacturing. Keep grounded for normal
operation.
Data Bus for Flash & Ethernet Controller(s)
Address Bus for Flash & Ethernet Controller(s)
Write Enable for Flash and Ethernet Controller(s)
Chip Select for Flash Memory Device
Chip Select for Ethernet Controller(s)
Output Enable
Wait State Signal from Ethernet Controller(s)
General-purpose I/O Signals
Reference Clock Input / Crystal Oscillator Input
Crystal Oscillator Output
A Buffered Version of XTI
PLL Loop Filter
MCLK Input
CS181xx Boot Mode Selection
©
Copyright 2004 Cirrus Logic, Inc.
CobraNet Hardware User's Manual
Pinout and Signal Descriptions
CS181xx Pin #
1
2
3, 4
9
29-32, 34, 35, 37, 39-43,
45, 46, 48, 49
55, 56, 58, 59, 61, 62, 64,
67, 68, 70-72, 74, 75, 77,
82, 84, 85, 87, 88
38
90
65
89
96
99, 100, 108
125
124
123
127, 128
8
11, 16, 17, 19
15