co661al-d Connect One Ltd., co661al-d Datasheet - Page 14

• Manufacturer Part Number: co661al-d
• Description: Co661al-d Ichip Plus? Internet Controller? Is Part Of A Family Of Intelligent Peripheral Devices That Provides Internet Connectivity Solutions To A Myriad Of Embedded Devices.
• Manufacturer: Connect One Ltd.

4 Hardware Interface
iChip Plus CO661AL-D may interface a host CPU in one of two methods: Serial or
Parallel. The actual interface depends on the state of the –SER/PAR pin.
4.1 Serial Host Interface
The host interface is a serial DTE interface. Speeds of 2400, 4800, 9600, 19200, 38400,
57600, 115200 and 230400 bps are supported in the following data format:
All host serial input signals (RXDH, -CTSH, -DSRH) are 5V tolerant.
4.2 Parallel Host Interface
In parallel interface mode, iChip Plus connects to a host CPU through a parallel interface
using a PAL (i.e., Altera “EPM7032AEC44”). The host parallel BUS may be an 80x86
(Intel) or a 68K (Motorola) BUS. With some small changes to the PAL, the user may
customize an interface to any other BUS architecture. iChip Plus is connected to the
interface PAL through the following signals:
Notes:
iChip Plus CO661AL-D Datasheet
•
• -RD:
• -WR:
•
• -PRES: Parallel reset. When LOW, generates a reset signal to the parallel
• -PERR: Parallel error. When LOW, indicates a parallel interface error.
• POBE: Parallel Output Buffer Empty. When HIGH, indicates that the output
• PIBF:
PCS:
D0-D7: Bi-directional data BUS.
Table 4-1 Host Data Format
1: When hardware flow control is enabled, the iChip Plus transmitter will add
2: Parallel interface mode is available only from iChip Plus firmware version 801.
an additional stop bit.
Parity
None
Parallel chip select signal. When PCS is high, the PAL is selected.
When –RD is LOW, iChip Plus reads data from PAL.
When –WR is LOW, iChip Plus writes data to PAL.
interface.
buffer is empty and iChip Plus may send additional data to host. When
iChip Plus sends a data byte, this signal goes LOW until the host reads
the data.
Parallel Input Buffer Full. When HIGH, indicates that the input buffer is
full and iChip Plus may read a data byte from the host. When iChip Plus
reads the data byte, this signal goes LOW.
Data Length
(No. of Bits)
8
2
Stop Bits
No. of
1
1
Transmission
(No. of Bits)
Length
Hardware Interface
10
4-1