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Spectrum Digital, Inc
2-5
2.1.6 MISC Register
The MISC register is used to provide software control for miscellaneous board
functions. On the 6713 DSK, the MISC register controls how auxiliary signals are
brought out to the daughter-card connectors.
McBSP0 and McBSP1 are usually used as the control and data ports of the on-board
AIC23 codec. The power-on state of these bits (both 0s) represents that situation.
Set the corresponding McBSP select bit to use the McBSP with a daughter card
instead.
The Flash and CPLD share CE1 which means that the highest DSP address bit (A21)
is used to differentiate between the two. The FLASH_PAGE bit is driven to the Flash as
a replacement for that address line which is connected to A19 of the Flash. On a
standard DSK, the on-board Flash is not large enough for this bit to be significant.
FLASH_PAGE is only useful if the board is re-populated with a larger pin-compatible
Flash chip.
The scratch bits are unused. They can be set to any value.
Table 5: MISC Register
Bit
Name
R/W
Description
7
SCRATCH_5
R/W
Scratch bit 5
6
SCRATCH_4
R/W
Scratch bit 4
5
SCRATCH_3
R/W
Scratch bit 3
4
SCRATCH_2
R/W
Scratch bit 2
3
SCRATCH_1
R/W
Scratch bit 1
2
FLASH_PAGE
R/W
Flash address bit 19
1
MCBSP1SEL
R/W
McBSP1 on/off board (0 = on-board, 1 = off-board)
0
MCBSP0SEL
R/W
McBSP0 on/off board (0 = on-board, 1 = off-board)
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