Host Cts And Dcd Signal Enable Headers; User Map Select Header - Motorola M68705EVM User Manual

2.3.2 Host CTS and DCD Signal Enable Headers (JS and J11)
Jumper headers J8 and J11 are used to configure the RS-232C host computer
1/0
port for
semi or full handshaking operation. The EVM is factory-configured for semi handshaking
(high level) operation. This semi handshaking configuration (high level) is accomplished by
the installation of fabricated jumpers on jumper headers J8 and J11 as shown below.
JS J11
1
I
1
I
HIGH LEVEL HIGH LEVEL
2
2
FULL HANDSHAKE FULL HANDSHAKE
3
•
3
•
CTS
DCD
Should the host computer or modem require full handshake capability, jumpers are to be
repositioned between pins 2 and 3. Refer to the schematic diagrams located in Chapter 5 for
CTS and DCD signal wiring information.
2.3.3 User Map Select Header (J10)
Jumper header J 1 O is used to select either a 2K-byte user map for MC68705P3 evaluation or
a 4K-byte user map for MC68705R3/U3 evaluation. The EVM is factory-configured and
shipped with the 4K-byte user map selected. This is accomplished by the installation of a
fabricated jumper on pins 1 and 2 as shown below.
1
2
J10
I
4K BYTE USER MAP
2K BYTE USER MAP
3 •
EVALUATION MODULE USER'S MANUAL MOTOROLA
M68705EVM 2-5