cp3cn17 National Semiconductor Corporation, cp3cn17 Datasheet - Page 120
cp3cn17
Manufacturer Part Number
cp3cn17
Description
Reprogrammable Connectivity Processor With Can Interface
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3CN17.pdf
(220 pages)
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17.9.5
The LOGIN register is an 8-bit wide write-only register. It is
used to receive 8-bit logarithmic PCM data from the periph-
eral bus and convert it into 13-bit linear PCM data.
17.9.6
The LOGOUT register is an 8-bit wide read-only register. It
holds logarithmic PCM data that has been converted from
linear PCM data. After reset, the LOGOUT register is clear.
17.9.7
The LINEARIN register is a 16-bit wide write-only register.
The data is left-aligned. When converting to A-law, bits 2:0
are ignored. When converting to µ-law, bits 1:0 are ignored.
17.9.8
The LINEAROUT register is a 16-bit wide read-only register.
The data is left-aligned. When converting from A-law, bits
2:0 are clear. When converting from µ-law, bits 1:0 are clear.
After reset, this register is clear.
17.9.9
The CVCTRL register is a 16-bit wide, read/write register
that controls the mode of operation and of the module’s in-
terrupts. At reset, all implemented bits are cleared.
15 14
15
15
DMA
Res. RESOLUTION PCMCONV CVSDCONV DMAPI
PO
7
7
7
DMA
Logarithmic PCM Data Input Register (LOGIN)
Logarithmic PCM Data Output Register
(LOGOUT)
Linear PCM Data Input Register (LINEARIN)
Linear PCM Data Output Register
(LINEAROUT)
CVSD Control Register (CVCTRL)
13
CI
6
DMA
CO
5
12
CVSD
LINEAROUT
ERR-
INT
LINEARIN
LOGOUT
4
LOGIN
11
CVSD
INT
3
PCM
10
INT
2
CLK
EN
9
1
CVEN
8
0
0
0
0
0
120
CVEN
CLKEN
PCMINT
CVSDINT
CVSDERRINT The CVSD FIFO Error Interrupt Enable bit
DMACO
DMACI
DMAPO
The Module Enable bit enables or disables the
CVSD conversion module interface. When the
bit is set, the interface is enabled which allows
read and write operations to the rest of the
module. When the bit is clear, the module is
disabled. When the module is disabled the
status register CVSTAT will be cleared to its
reset state.
0 – CVSD module enabled.
1 – CVSD module disabled.
The CVSD Clock Enable bit enables the 2-
MHz clock to the filter engine and CVSD en-
coders and decoders.
0 – CVSD module clock disabled.
1 – CVSD module clock enabled.
The PCM Interrupt Enable bit controls gener-
ation of the PCM interrupt
ables the PCM interrupt. If the PCMINT bit is
clear, the PCM interrupt is disabled. After re-
set, this bit is clear.
0 – PCM interrupt disabled.
1 – PCM interrupt enabled.
The CVSD FIFO Interrupt Enable bit controls
generation of the CVSD interrupt. If set, this
bit enables the CVSD interrupt that occurs if
the CVSD In FIFO is nearly empty or the
CVSD Out FIFO is nearly full. If the CVSDINT
bit is clear, the CVSD nearly full/nearly empty
interrupt is disabled. After reset, this bit is
clear.
0 – CVSD interrupt disabled.
1 – CVSD interrupt enabled.
controls generation of the CVSD error inter-
rupt. If set, this bit enables an interrupt to oc-
cur when the CVSD Out FIFO is full or the
CVSD In FIFO is empty. If the CVSDERROR-
INT bit is clear, the CVSD full/empty interrupt
is disabled. After reset, this bit is clear.
0 – CVSD error interrupt disabled.
1 – CVSD error interrupt enabled.
The DMA Enable for CVSD Out bit enables
hardware DMA control for reading CVSD data
from the CVSD Out FIFO. If clear, DMA sup-
port is disabled. After reset, this bit is clear.
0 – CVSD output DMA disabled.
1 – CVSD output DMA enabled.
The DMA Enable for CVSD In bit enables
hardware DMA control for writing CVSD data
into the CVSD In FIFO. If clear, DMA support
is disabled. After reset, this bit is clear.
0 – CVSD input DMA disabled.
1 – CVSD input DMA enabled.
The DMA Enable for PCM Out bit enables
hardware DMA control for reading PCM data
from the PCMOUT register. If clear, DMA sup-
port is disabled. After reset, this bit is clear.
0 – PCM output DMA disabled.
1 – PCM output DMA enabled.
.
If set, this bit en-
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