PRELIMINARY
CYP15G0401TB
Document #: 38-02112 Rev. **
Page 28 of 30
Table 14.Valid Special Character Codes and Sequences (TXCTx = special character code) [28, 29]
S.C. Code Name
S.C. Byte Name
Current RD
−
abcdei fghj
Current RD+
abcdei fghj
Cypress
Alternate
S.C. Byte
Name [30]
Bits
HGF EDCBA
S.C. Byte Name
[30]
Bits
HGF EDCBA
K28.0
C0.0
(C00)
000 00000
C28.0
(C1C)
000 11100
001111 0100
110000 1011
K28.1 [31]
C1.0
(C01)
000 00001
C28.1
(C3C)
001 11100
001111 1001
110000 0110
K28.2 [31]
C2.0
(C02)
000 00010
C28.2
(C5C)
010 11100
001111 0101
110000 1010
K28.3
C3.0
(C03)
000 00011
C28.3
(C7C)
011 11100
001111 0011
110000 1100
K28.4 [31]
C4.0
(C04)
000 00100
C28.4
(C9C)
100 11100
001111 0010
110000 1101
K28.5 [31, 32]
C5.0
(C05)
000 00101
C28.5
(CBC)
101 11100
001111 1010
110000 0101
K28.6 [31]
C6.0
(C06)
000 00110
C28.6
(CDC)
110 11100
001111 0110
110000 1001
K28.7 [31, 33]
C7.0
(C07)
000 00111
C28.7
(CFC)
111 11100
001111 1000
110000 0111
K23.7
C8.0
(C08)
000 01000
C23.7
(CF7)
111 10111
111010 1000
000101 0111
K27.7
C9.0
(C09)
000 01001
C27.7
(CFB)
111 11011
110110 1000
001001 0111
K29.7
C10.0
(C0A)
000 01010
C29.7
(CFD)
111 11101
101110 1000
010001 0111
K30.7
C11.0
(C0B)
000 01011
C30.7
(CFE)
111 11110
011110 1000
100001 0111
End of Frame Sequence
EOFxx [34]
C2.1
(C22)
001 00010
C2.1
(C22)
001 00010
–K28.5, Dn.xxx0
+K28.5, Dn.xxx1
Code Rule Violation and SVS Tx Pattern
Exception[33, 35]
C0.7
(CE0)
111 00000
C0.7
(CE0)
111 00000[39]
100111 1000
011000 0111
−K28.5 [36]
C1.7
(CE1)
111 00001
C1.7
(CE1)
111 00001[39]
001111 1010
001111 1010
+K28.5[37]
C2.7
(CE2)
111 00010
C2.7
(CE2)
111 00010[39]
110000 0101
110000 0101
Running Disparity Violation Pattern
Exception[38]
C4.7
(CE4)
111 00100
C4.7
(CE4)
111 00100[39]
110111 0101
001000 1010
Notes:
28. All codes not shown are reserved.
29. Notation for Special Character Code Name is consistent with Fibre Channel and ESCON naming conventions. Special Character Code Name is intended to
describe binary information present on I/O pins. Common usage for the name can either be in the form used for describing Data patterns (i.e., C0.0 through
C31.7), or in hex notation (i.e., Cnn where nn = the specified value between 00 and FF).
30. Both the Cypress and alternate encodings may be used for data transmission to generate specific Special Character Codes.
31. These characters are used for control of ESCON interfaces. They can be sent as embedded commands or other markers when not operating using ESCON
protocols.
32. The K28.5 character is used for framing operations by the remote receiver. It is also the pad or fill character transmitted to maintain the serial link when no user
data is available.
33. Care must be taken when using this Special Character code. When a K28.7(C7.0) or SVS(C0.7) is followed by a D11.x or D20.x, an alias K28.5 sync character
is created. These sequences can cause erroneous framing at the remote receiver and should be avoided.
34. C2.1 = Transmit either
−K28.5+ or +K28.5− as determined by Current RD and modify the Transmission Character that follows, by setting its least significant bit
to 1 or 0. If Current RD at the start of the following character is plus (+) the LSB is set to 0, and if Current RD is minus (
−) the LSB becomes 1. This modification
allows construction of X3.230 “EOF” frame delimiters wherein the second data byte is determined by the Current RD.
For example, to send “EOFdt” the controller could issue the sequence C2.1
−D21.4− D21.4−D21.4, and the HOTLink II Transmitter will send either
K28.5
−D21.4−D21.4−D21.4 or K28.5−D21.5− D21.4−D21.4 based on Current RD. Likewise to send “EOFdti” the controller could issue the sequence
C2.1
−D10.4−D21.4−D21.4, and the HOTLink II Transmitter will send either K28.5−D10.4−D21.4− D21.4 or K28.5−D10.5−D21.4− D21.4 based on Current RD.
The remote receiver will never output this Special Character, since K28.5 is decoded as C5.0, C1.7, or C2.7, and the subsequent bytes are decoded as data.
35. C0.7 = Transmit a deliberate code rule violation. The code chosen for this function follows the normal Running Disparity rules. The remote receiver will only output
this Special Character if the Transmission Character being decoded is not found in the tables.
36. C1.7 = Transmit Negative K28.5 (
−K28.5+) disregarding Current RD. The remote receiver will only output this Special Character if K28.5 is received with the
wrong running disparity. The receiver will output C1.7 if
−K28.5 is received with RD+, otherwise K28.5 is decoded as C5.0 or C2.7.
37. C2.7 = Transmit Positive K28.5 (+K28.5
−) disregarding Current RD. The receiver will only output this Special Character if K28.5 is received with the wrong running
disparity. The receiver will output C2.7 if +K28.5 is received with RD
−, otherwise K28.5 is decoded as C5.0 or C1.7.
38. C4.7 = Transmit a deliberate code rule violation to indicate a Running Disparity violation. The receiver will only output this Special Character if the Transmission
Character being decoded is found in the tables, but Running Disparity does not match. This might indicate that an error occurred in a prior byte.
39. Supported only for data transmission. The receive status for these conditions will be reported by specific combinations of receive status bits.
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