Spectrum Digital TMS320C6416 DSK, Техническое описание

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Spectrum Digital, Inc
2-3
2.1.2 CPLD Registers
The 4 CPLD memory-mapped registers allows users to control CPLD functions in
software. On the 6416 DSK the registers are primarily used to access the LEDs and
DIP switches and control the daughter card interface. The registers are mapped into
EMIFB data space at address 0x60000000. They appear as 8-bit registers with a
simple asynchronous memory interface. The following table gives a high level
overview of the CPLD registers and their bit fields:
The table below shows the bit definitions for the 4 registers in CPLD.
2.1.3 USER_REG Register
USER_REG is used to read the state of the 4 DIP switches and turn the 4 LEDs on or
off to allow the user to interact with the DSK. The DIP switches are read by reading the
top 4 bits of the register and the LEDs are set by writing to the low 4 bits.
Table 1: CPLD Register Definitions
Offset Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 USER_REG USR_SW3
R
USR_SW2
R
USR_SW1
R
USR_SW0
R
USR_LED3
R/W
0(Off)
USR_LED2
R/W
0(Off)
USR_LED1
R/W
0(Off)
USR_LED0
R/W
0(Off)
1 DC_REG DC_DET
R
0 DC_STAT1
R
DC_STAT0
R
DC_RST
R
0(No reset)
0 DC_CNTL1
R/W
0(low)
DC_CNTL0
R/W
0(low)
4 VERSION CPLD_VER[3.0]
R
0 BOARD VERSION[2.0]
R
6 MISC McBSP2_EN
R
(MCBSP2
enabled)
SCR_4
R/W
0
SCR_3
R/W
0
DSPPLL_
SELECT
R
1
DSPPLL_
ENABLE
R
1
FLASH_PAGE
R/W
0
(A19=0)
McBSP2
ON/OFF
Board
R/W
0
(Onboard)
McBSP1
ON/OFF
Board
R/W
0
(Onboard)
Table 2: CPLD USER_REG Register
Bit Name R/W Description
7 USER_SW3 R User DIP Switch 3(1 = Off, 0 = On)
6 USER_SW2 R User DIP Switch 2(1 = Off, 0 = On)
5 USER_SW1 R User DIP Switch 1(1 = Off, 0 = On)
4 USER_SW0 R User DIP Switch 0(1 = Off, 0 = On)
3 USER_LED3 R/W User-defined LED 3 Control (0 = Off, 1 = On)
2 USER_LED2 R/W User-defined LED 2 Control (0 = Off, 1 = On)
1 USER_LED1 R/W User-defined LED 1 Control (0 = Off, 1 = On)
0 USER_LED0 R/W User-defined LED 0 Control (0 = Off, 1 = On)