FDC37B727-NS Standard Microsystems (SMSC), FDC37B727-NS Datasheet - Page 101
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FDC37B727-NS
Manufacturer Part Number
FDC37B727-NS
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.FDC37B727-NS.pdf
(238 pages)
Specifications of FDC37B727-NS
Pin Count
128
Lead Free Status / RoHS Status
Compliant
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000:
001:
010:
011:
100:
101:
110:
111:
IRQ SELECTED
All Others
Standard Parallel Port Mode . In this mode the FIFO is reset and common collector drivers are
used on the control lines (nStrobe, nAutoFd, nInit and nSelectIn). Setting the direction bit will
not tri-state the output drivers in this mode.
PS/2 Parallel Port Mode. Same as above except that direction may be used to tri-state the
data lines and reading the data register returns the value on the data lines and not the value in
the data register. All drivers have active pull-ups (push-pull).
Parallel Port FIFO Mode. This is the same as 000 except that bytes are written or DMAed to the
FIFO. FIFO data is automatically transmitted using the standard parallel port protocol. Note that
this mode is only useful when direction is 0. All drivers have active pull-ups (push-pull).
ECP Parallel Port Mode. In the forward direction (direction is 0) bytes placed into the ecpDFifo
and bytes written to the ecpAFifo are placed in a single FIFO and transmitted automatically to
the peripheral using ECP Protocol. In the reverse direction (direction is 1) bytes are moved from
the ECP parallel port and packed into bytes in the ecpDFifo. All drivers have active pull-ups
(push-pull).
Selects EPP Mode: In this mode, EPP is selected if the EPP supported option is selected in
configuration register L3-CRF0. All drivers have active pull-ups (push-pull).
Reserved
Test Mode. In this mode the FIFO may be written and read, but the data will not be transmitted
on the parallel port. All drivers have active pull-ups (push-pull).
Configuration Mode. In this mode the confgA, confgB registers are accessible at 0x400 and
0x401. All drivers have active pull-ups (push-pull).
15
14
11
10
9
7
5
Table 43B
TABLE 43 - EXTENDED CONTROL REGISTER
CONFIG REG B
BITS 5:3
110
101
100
011
010
001
111
000
101
MODE
DMA SELECTED
All Others
Table 43C
3
2
1
CONFIG REG B
BITS 2:0
011
010
001
000
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