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CYV15G0404DXB
Document #: 38-02097 Rev. *B Page 42 of 44
Table 15. Valid Special Character Codes and Sequences (TXCTx = special character code or RXSTx[2:0] = 001)
[38, 39]
S.C. Code Name
S.C. Byte Name
Current RD−
abcdei fghj
Current RD+
abcdei fghj
Cypress Alternate
S.C. Byte
Name
[40]
Bits
HGF EDCBA
S.C. Byte
Name
[40]
Bits
HGF EDCBA
K28.0 C0.0 (C00) 000 00000 C28.0 (C1C) 000 11100 001111 0100 110000 1011
K28.1
[41]
C1.0 (C01) 000 00001 C28.1 (C3C) 001 11100 001111 1001 110000 0110
K28.2
[41]
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
[41]
C4.0 (C04) 000 00100 C28.4 (C9C) 100 11100 001111 0010 110000 1101
K28.5
[41, 42]
C5.0 (C05) 000 00101 C28.5 (CBC) 101 11100 001111 1010 110000 0101
K28.6
[41]
C6.0 (C06) 000 00110 C28.6 (CDC) 110 11100 001111 0110 110000 1001
K28.7
[41, 43]
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 C2.1 (C22) 001 00010 C2.1 (C22) 001 00010 −K28.5,Dn.xxx0
[44]
+K28.5,Dn.xxx1
[44]
Code Rule Violation and SVS Tx Pattern
Exception
[43, 45]
C0.7 (CE0) 111 00000 C0.7 (CE0) 111 00000 100111 1000 011000 0111
−K28.5
[46]
C1.7 (CE1) 111 00001 C1.7 (CE1) 111 00001 001111 1010 001111 1010
+K28.5
[47]
C2.7 (CE2) 111 00010 C2.7 (CE2) 111 00010 110000 0101 110000 0101
Running Disparity Violation Pattern
Exception
[48]
C4.7 (CE4) 111 00100 C4.7 (CE4) 111 00100 110111 0101 001000 1010
Notes
38.All codes not shown are reserved.
39.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).
40.Both the Cypress and alternate encodings may be used for data transmission to generate specific Special Character Codes. The decoding process for received
characters generates Cypress codes or Alternate codes as selected by the BOE[7:0] configuration inputs.
41.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.
42.The K28.5 character is used for framing operations by the receiver. It is also the pad or fill character transmitted to maintain the serial link when no user data is
available.
43.Care must be taken when using this Special Character code. When a C7.0 or a 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 and should be avoided while RFENx = 1.
44.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 Transmitter sends 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 Transmitter sends either K28.5–D10.4–D21.4– D21.4 or K28.5–D10.5–D21.4–D21.4 based on Current RD.
The receiver never outputs this Special Character, since K28.5 is decoded as C5.0, C1.7, or C2.7, and the subsequent bytes are decoded as data.
45.C0.7 = Transmit a deliberate code rule violation. The code chosen for this function follows the normal Running Disparity rules. Transmission of this Special
Character has the same effect as asserting TXSVS = HIGH. The receiver only outputs this Special Character if the Transmission Character being decoded is
not found in the tables.
46.C1.7 = Transmit Negative K28.5 (−K28.5+) disregarding Current RD. The receiver only outputs this Special Character if K28.5 is received with the wrong running
disparity. The receiver outputs C1.7 if −K28.5 is received with RD+, otherwise K28.5 is decoded as C5.0 or C2.7.
47.C2.7 = Transmit Positive K28.5 (+K28.5−) disregarding Current RD. The receiver only outputs this Special Character if K28.5 is received with the wrong running
disparity. The receiver outputs C2.7 if +K28.5 is received with RD−, otherwise K28.5 is decoded as C5.0 or C1.7.
48.C4.7 = Transmit a deliberate code rule violation to indicate a Running Disparity violation. The receiver only outputs 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.
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