參數(shù)資料
型號(hào)： SST-MELODY-DAP
英文描述： SST-Melody&#174:-DAP: Audio Processor Data Sheet (Rev. 0. 10/02)
文件頁(yè)數(shù)： 18/24頁(yè)
文件大?。?/td> 585K
代理商： SST-MELODY-DAP
REV. 0
–18–
SST-Melody-DAP
PM (MODE B = 0)
PM (MODE B = 1)
1
ALWAYS
ACCESSIBLE
AT ADDRESS
0x0000 – 0x1FFF
ACCESSIBLE WHEN
PMOVLAY = 0
RESERVED
ACCESSIBLE WHEN
PMOVLAY = 0
ACCESSIBLE WHEN
PMOVLAY = 1
ACCESSIBLE WHEN
PMOVLAY = 2
0x2000 –
0x3FFF
0x2000 –
0x3FFF
2
0x2000 –
0x3FFF
2
EXTERNAL
MEMORY
PROGRAM MEMORY
MODE B = 0
ADDRESS
0x3FFF
8K INTERNAL
PMOVLAY = 0
OR
8K EXTERNAL
PMOVLAY = 1, 2
8K
INTERNAL
8K
EXTERNAL
0x2000
0x0000
0x1FFF
8K INTERNAL
PMOVLAY = 0
0x3FFF
0x2000
0x0000
0x1FFF
PROGRAM MEMORY
MODE B = 1
ADDRESS
0x2000 –
0x3FFF
0x0000 –
0x1FFF
2
0x0000 –
0x1FFF
2
EXTERNAL
MEMORY
NOTES
1
WHEN MODE B = 1, PMOVLAY MUST BE SET TO 0
2
SEE TABLE VII FOR PMOVLAY BITS
ACCESSIBLE WHEN
PMOVLAY = 0
RESERVED
consumption, or if the PF2 pin is to be used as an output in the
DSP application, a weak pull-up or pull-down, on the order of
10 k
, can be used. This value should be sufficient to pull the pin
to the desired level and still allow the pin to operate as a program-
mable flag output without undue strain on the processor’s output
driver. For minimum power consumption during power-down,
reconfigure PF2 to be an input, as the pull-up or pull-down will
hold the pin in a known state, and will not switch.
Active Configuration
Active configuration involves the use of a three-statable exter
nal
driver connected to the Mode C pin. A driver’s output
enable
should be connected to the DSP’s RESET signal such
that
it
only drives the PF2 pin when RESET is active low. When
RESET is deasserted, the driver should three-state, thus
allowing full use of the PF2 pin as either an input or output. To
minimize power consumption during power-down, configure
the programmable flag as an output when connected to a three-
stated buffer. This ensures that the pin will be held at a constant
level and will not oscillate should the three-state driver’s level
hover around the logic switching point.
PMOVLAY
Memory
A13
A12:0
0
1
2
Internal
External Overlay 1
External Overlay 2
Not Applicable
0
1
Not Applicable
13 LSBs of Address between 0x2000 and 0x3FFF
13 LSBs of Address between 0x2000 and 0x3FFF
Table VII. PMOVLAY Bits
Figure 7. Program Memory
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