SCD128410QCE Intel, SCD128410QCE Datasheet - Page 63
SCD128410QCE
Manufacturer Part Number
SCD128410QCE
Description
Manufacturer
Intel
Datasheet
1.SCD128410QCE.pdf
(176 pages)
Specifications of SCD128410QCE
Pin Count
100
Lead Free Status / RoHS Status
Not Compliant
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Part Number:
SCD128410QCE
Manufacturer:
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IEEE 1284-Compatible Parallel Interface Controller — CD1284
5.7.2
Non-UNIX Receive Special Character Processing
In addition to UNIX special-character processing, the CD1284 provides other special character
recognition capabilities. The CD1284 has four registers that define special characters, SCHR1–
SCHR4. SCHR1 and SCHR2, are used in flow-control activities and (see
Section
5.6). SCHR3 and
SCHR4 define two additional special characters that the CD1284 can scan for in the receive data
stream. Recognition of special characters 3 and 4 are enabled by the SCD34 bit (COR3[6]). If
either of these characters are received, a special character detect (receive exception) service request
is sent. Note that if automatic in-band flow control is not enabled, SCHR1 and SCHR2 can still be
used as special characters. They are detected and reported as receive exceptions, but they do not
cause flow-control activities to be envoked.
The range detect function is another special character function. If this mode is enabled (COR3[7]
set), the CD1284 compares all received characters against the values in the SCRL and SCRH
registers. If the character received falls between these two values (inclusive), a special character
detect service request is posted.
The status shown in the RDSR indicates which of the special character recognition conditions were
met and caused the receive exception service request.
Datasheet
63
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