cx28365 Mindspeed Technologies, cx28365 Datasheet - Page 68

• Manufacturer Part Number: cx28365
• Description: X12, X6, X4 T3/e3 Framer And Atm Cell Transmission Convergence Sublayer Processor
• Manufacturer: Mindspeed Technologies

Functional Description
Figure 2-13. Receiver System Side Outputs [RxGCKO]
2-30
b)
a)
c)
1.
2.
3.
4.
The RxSync output signal has two modes based on the selection of the RxOvhMrk
field of the CR08 register:
Figure 2-13
a general data stream that represents seven bits (bits 1, 3, 5, and 7: payload [P]; bit 2:
Cj overhead [C]; bits 4 and 6: non-Cj overhead [O]; bit 3 is the last bit of one frame,
bit 4 is the first bit of the next frame).
a) RxCKI, internally-used receiver clock.
b) RxDATO, data output.
c) RxGCKO, in three of the five modes (ungapped, overhead gapped, and non-C
gapped), each available at either rising or falling edge polarity (only shown for
ungapped, but valid for all five modes).
d) REXTCKO, in three representative selections (no output, partial Overhead bit
output, and full Payload and Overhead bit output). Each is available at either rising or
falling edge.
selections.
1.
2.
3.
4.
5.
1.
2.
NOTE:
Preliminary Information/Mindspeed Proprietary and Confidential
P
Ungapped (identifies every payload and Overhead bit)
Overhead gapped (identifies every Payload bit)
Non-Cj gapped (identifies every Payload and Justification Control bit)
Non-stuff gapped (identifies every Payload and Stuff Opportunity bit)
Non-Cj and stuff gapped (identifies every payload bit, Justification Control bit,
and Stuff Opportunity bit)
As a frame synchronization signal, it rises from low to high on the first bit of each
frame. It returns to low after the third M-bit in DS3; mode it returns to low after
the first Cj-bit in E3-G.751 mode, and it returns to low after the last bit of the GC
byte in E3-G.832 mode.
As an overhead marker signal, it is low on all Overhead bits and high on all
Payload bits.
C
P
illustrates the ideal behavior of system-side outputs, in several modes, for
Figure 2-14
Mindspeed Technologies™
Justification Control and Stuff Opportunity bits are viewed as Overhead bits.
O
P
O
illustrates partial Overhead bit output, but it is valid for all
P
RxCKI, receive clock
RxDATO, data output
RxGCKO, ungapped mode,
rising edge polarity
RxGCKO, ungapped mode,
falling edge polarity
RxGCKO, overhead gapped mode
RxGCKO, non-C
j
gapped mode
CX28365/6/4 Data Sheet
500028C
500028_026
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