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參數(shù)資料
| 型號： | CY7C924DX |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 200-MBaud HOTLink Transceiver(200H波特?zé)峤硬迨瞻l(fā)器) |
| 中文描述： | 200 MBd的的HOTLink收發(fā)器（200小時波特?zé)峤硬迨瞻l(fā)器） |
| 文件頁數(shù)： | 15/58頁 |
| 文件大小： | 636K |
| 代理商： | CY7C924DX |
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CY7C924DX
PRELIMINARY
15
acter code tables (
Tables 10
and
11
) found near the end of this
data sheet.
When the TXSOC bit (as read from the Transmit FIFO) is
HIGH, an extra character is inserted into the data stream. This
extra character is always a Special Character code (see
Table
11
) that is used to inform the remote receiver that the immedi-
ately following character should be interpreted differently from
its normal meaning. The associated character present on
TXDATA[x:0] is always encoded as a data character.
The 100b combination (TXSOC = 1, TXSC/D* = 0, and
TXSVS = 0) is used as a marker for the start of a cell, frame,
or packet of data being sent across the interface. When a char-
acter is read from the Transmit FIFO with this combination of
bits set, a C8.0 Special Character code is sent to the Encoder
prior to sending the associated data character.
The 101b character format has the same function as the 001b
and 011b normal data modes. It instructs the encoder to dis-
card the associated data character and to replace it with a
C0.7 Exception character.
The 110b character format is used to expand the command
space beyond that available with the default 8B/10B code. The
8B/10B code normally supports a
data
space of 256 data char-
acters, and a
command
(non-data) space of twelve command
characters (C0.0
–
C11.0 in
Table 11
). For those data links
where this is not sufficient, the 110b format can be used to
mark the associated data as an extended command. This ex-
pands the command space to 256 commands (in addition to
some of the present twelve). When a character is read from
the Transmit FIFO with these bits set, a C9.0 Special Charac-
ter code is sent to the Encoder prior to sending the data char-
acter.
The 111b character format is used to send a serial addresses
to attached receivers. These serial addresses allow a host to
direct (the following) data to a specific destination or destina-
tions, when the CY7C924DX devices are connected in a ring
or bus topology.
The Serial Address marker may also be used to send packet
identification fields, sequence numbers, or other high-level
routing information for those point-to-point connections that do
not require physical address capabilities, however, the report-
ing of the address field contents may be affected by the
present receiver discard policy. This marking or tagging capa-
bility can be performed with the 100b or 110b character for-
mats without concern for receiver discard policy.
When a character is read from the Transmit FIFO with these
bits set, a C10.0 Special Character is sent to the Encoder prior
to sending the associated data character.
Byte-Packer
The byte-packer is a logical construct, used to control the effi-
cient segmentation of 10-bit source data into 8-bit characters.
This conversion allows these characters to be transported us-
ing 8B/10B encoding, with the same encoding overhead (20%)
as when sending 8-bit characters. Because the serializer con-
tinues to operate using 10-bit transmission characters, this en-
coding mode can only operate with the Transmit FIFO enabled.
The byte-packer operates by taking pieces of one or more 10-
bit characters, combining them into 8-bit groups, and passing
these groups to the 8B/10B encoder. It takes exactly five 8-bit
characters to transport four 10-bit characters. The allocation is
performed, as shown in
Figure 4
, where the low-order eight
bits of the first 10-bit character (A[7:0]) are passed to the en-
coder on the first clock cycle. During the second clock cycle
the remaining two bits of the first character are combined with
the lower six bits of the second 10-bit character
(B[5:0]+A[9:8]). In the third clock cycle the remaining four bits
of the second 10-bit character are combined with the lower four
bits of the third 10-bit character (C[3:0]+B[9:6]). In the fourth
clock cycle the remaining six bits of the third 10-bit character
are combined with the lower two bits of the fourth 10-bit char-
acter (D[1:0]+C[9:4]). In the fifth clock cycle the remaining
eight bits of the fourth 10-bit character are passed to the en-
coder (D[9:2]).
This process repeats for additional data characters present in
the FIFO. If at any time the Transmit FIFO is emptied, and a
portion of a 10-bit character has not yet been transmitted, the
remaining bits of the 8-bit character are filled with dummy bits
before that character is passed to the encoder. The 8-bit char-
acter containing these dummy bits is immediately followed by
Table 2. Transmit Data Formatting
T
T
T
Data Format Operation
Normal Data Encode
Replace Character with C0.7 Exception
Normal Command Encode
Replace Character with C0.7 Exception
Send Start of Cell Marker (C8.0) +
Data Character
Replace Character with C0.7 Exception
Send Extended Command Marker (C9.0) +
Data Character
Send Serial Address Marker (C10.0) +
Data Character
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
1
1
0
1
1
0
1
1
1
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