I/O Expanders - Spectrum Digital TMS320DM6437 Technical Reference

2.6.1 I/O Expanders

The DM6437 EVM uses four I
of these is an 8 bit I/O expander, a PCF8574A. At Power Up Reset the expanders are
initialized to 0xFF, all ones. The functions for each of the I/O expanders are shown in
the tables below.
Pin Number
P0
P1
P2
P3
P4
P5
P6
P7
Pin Number
P0
P1
P2
P3
P4
P5
P6
P7
2
C expanders to handle various bit I/O functions. Each
Table 2: U10 I/O Expander
Function
JP1 NTSC/PAL Select
SW7 Slide Switch
Reserved
Reserved
SW4-1
SW4-2
SW4-3
SW4-4
Table 3: U11 I/O Expander
Function
User LED DS1
User LED DS2
User LED DS3
User LED DS4
VLYNQ Reset
Reserved
User I/O DC_P2
User I/O DC_P2
Decription
Read only video mode,1=NTSC,0=PAL
Read only slide switch
None
None
Read only user switch
Read only user switch
Read only user switch
Read only user switch
Description
0=Turns LED on, 1=Turns LED off
0=Turns LED on, 1=Turns LED off
0=Turns LED on, 1=Turns LED off
0=Turns LED on, 1=Turns LED off
0=Removes Reset, 1=Applies Reset
None
To daughter card, DC_P2 Pin 81
To daughter card, DC_P2 Pin 82
Spectrum Digital, Inc
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