Signal Descriptions; Host Port Signals; Asynchronous Serial Port (Uart Bridge) Signals - Cirrus Logic CobraNet Silicon Series Hardware User Manual

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
Manual.
Signal Description
HDATA[7:0] Host Data
HADDR[3:0] Host Address
Host
HRW
Direction
HREQ Host Request
HACK Host Alert
HDS Host Strobe
HEN Host Enable

4.2.2 Asynchronous Serial Port (UART Bridge) Signals

Level-shifting drive circuits are typically required between these signals and any external
connections.
Signal Description
Asynchronous Serial
UART_RXD
Receive Data
Asynchronous Serial
UART_TXD
Transmit Data
UART_TX_OE Transmit Drive Enable
12
"Host Management Interface (HMI)" on page 23
CM-2 CS181xx
Direction
Pin # Pin #
111, 112,
J1:A19, 114, 115,
In/Out
A[17:11] 117, 118,
102, 121
J1:A20, 105, 106,
In
A[10:8] 109,110
In J1:A4 107
Out J1:A6 140
Out J1:A3 102
In J1:A5 103
In J1:A7 104
CM-2
Direction
Pin #
In J1:A1
Out J1:B1
Out J1:A2
©
Copyright 2004 Cirrus Logic, Inc.
Notes
Host port data.
Host port address.
Host port transfer direction.
Host port data request.
Host port interrupt request.
Host port strobe.
Host Port Enable.
CS181xx
Pin #
26 Pull-up to VCC if unused.
25
Enable transmit (active high) drive for two
23
wire multi-drop interface.
of this
Notes
DS651UM21
Version 2.1