CYP15G0401DXB
CYV15G0401DXB
Table 27. Valid Special Character Codes and Sequences (TXCTx = special character code or RXSTx[2:0] = 001) [45, 46]
S.C. Byte Name
Cypress
Alternate
S.C. Byte
Bits
S.C. Byte Name
Bits
Current RD−
Current RD+
abcdei fghj
[47]
S.C. Code Name
K28.0
Name [47]
HGF EDCBA
HGF EDCBA
abcdei fghj
C0.0
(C00)
(C01)
(C02)
(C03)
(C04)
(C05)
(C06)
(C07)
(C08)
(C09)
000 00000 C28.0 (C1C)
000 00001 C28.1 (C3C)
000 00010 C28.2 (C5C)
000 00011 C28.3 (C7C)
000 00100 C28.4 (C9C)
000 00101 C28.5 (CBC)
000 00110 C28.6 (CDC)
000 11100
001 11100
010 11100
011 11100
100 11100
101 11100
110 11100
111 11100
111 10111
111 11011
111 11101
111 11110
001111 0100
001111 1001
001111 0101
001111 0011
001111 0010
001111 1010
001111 0110
001111 1000
111010 1000
110110 1000
101110 1000
011110 1000
110000 1011
110000 0110
110000 1010
110000 1100
110000 1101
110000 0101
110000 1001
110000 0111
000101 0111
001001 0111
010001 0111
100001 0111
K28.1 [48]
K28.2 [48]
K28.3
C1.0
C2.0
C3.0
C4.0
C5.0
C6.0
C7.0
C8.0
C9.0
K28.4 [48]
K28.5 [48, 49]
K28.6 [48]
K28.7 [48, 50]
K23.7
K27.7
K29.7
K30.7
000 00111
C28.7 (CFC)
000 01000 C23.7 (CF7)
000 01001 C27.7 (CFB)
000 01010 C29.7 (CFD)
000 01011 C30.7 (CFE)
C10.0 (C0A)
C11.0 (C0B)
End of Frame Sequence
EOFxx [51]
C2.1 (C22)
Code Rule Violation and SVS Tx Pattern
001 00010 C2.1
(C22)
001 00010
–K28.5, Dn.xxx0
+K28.5, Dn.xxx1
Exception[50, 52] C0.7
(CE0)
(CE1)
(CE2)
111 00000
111 00001
111 00010
C0.7
C1.7
C2.7
(CE0)
(CE1)
(CE2)
111 00000[56]
111 00001[56]
111 00010[56]
100111 1000
001111 1010
110000 0101
011000 0111
001111 1010
110000 0101
−K28.5 [53]
C1.7
C2.7
+K28.5[54]
Running Disparity Violation Pattern
Exception[55]
C4.7
(CE4)
111 00100
C4.7
(CE4)
111 00100[56]
110111 0101
001000 1010
Notes:
45. All codes not shown are reserved.
46. 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).
47. 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 DECMODE configuration input.
48. 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.
49. 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.
50. 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 and should be avoided while RFEN = HIGH.
51. 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 IITransmitter 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 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.
52. C0.7 = Transmit a deliberate code rule violation. The code chosen for this function follows the normal Running Disparity rules. The receiver will only output this
Special Character if the Transmission Character being decoded is not found in the tables.
53. C1.7 = Transmit Negative 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 C1.7 if −K28.5 is received with RD+, otherwise K28.5 is decoded as C5.0 or C2.7.
54. 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.
55. 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.
56. Supported only for data transmission. The receive status for these conditions will be reported by specific combinations of receive status bits.
Document #: 38-02002 Rev. *K
Page 50 of 53
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