CS1810XX Datasheet, PDF (12/54 Pages) Cirrus Logic – Digital Audio Networking Processor

CobraNet Hardware User’s Manual
Pinout and Signal Descriptions
4.2 Signal Descriptions
4.2.1 Host Port Signals
The host port is used to manage and monitor the CobraNet interface. Electrical operation
and protocol is detailed in the "Host Management Interface (HMI)" on page 23 of this
Manual.
The host port can operate in two modes in order to accomodate Motorola^® or Intel^® style
interfaces. The default mode is Motorola. Intel mode is set via a firmware modification.
Table 2-1: Host Port Signals
Signal
Description Direction
CM-2
Pin #
CS1810xx/
CS4961xx Pin #
Notes
HDATA[7:0] Host Data
HADDR[3:0] Host Address
HRW
HRD
HREQ
HACK
HDS
HWR
HEN
HCS
Host
Direction
Host Read
Host Request
Host Alert
Host Strobe
Host Write
Host Enable
Select
In/Out
In
In
In
Out
Out
In
In
In
In
J1:A19,
A[17:11]
111, 112, 114,
115, 117, 118,
102, 121
Host port data.
J1:A20,
A[10:8]
105, 106, 109,110
Host port address.
J1:A4
107
Host port transfer direction (Motorola mode).
J1:A4
J1:A6
J1:A3
J1:A5
J1:A5
J1:A7
J1:A7
107
Host Read (Intel mode).
140
Host port data request.
102
Host port interrupt request.
103
Host port strobe (Motorola mode).
103
Host Write (Intel mode).
104
Host Port Enable.
104
Select (Intel mode).
4.2.2 Asynchronous Serial Port (UART Bridge) Signals
Level-shifting drive circuits are typically required between these signals and any external
connections.
Signal
UART_RXD
UART_TXD
UART_TX_OE
Description
Asynchronous Serial
Receive Data
Asynchronous Serial
Transmit Data
Transmit Drive Enable
Direction
In
Out
Out
CM-2
Pin #
J1:A1
J1:B1
J1:A2
CS1810xx/
CS4961xx Pin #
Notes
26
Pull-up to VCC if unused.
25
23
Enable transmit (active high) drive for
two wire multi-drop interface.
12
©Copyright 2005 Cirrus Logic, Inc.
DS651UM23
Version 2.3