參數資料
型號: DS26324GN+T&R
廠商: Maxim Integrated Products
文件頁數: 51/120頁
文件大?。?/td> 0K
描述: IC LIU E1/T1/J1 3.3V 256-CSBGA
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 500
類型: 線路接口裝置(LIU)
驅動器/接收器數: 16/16
規(guī)程: LIN
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 256-LBGA,CSBGA
供應商設備封裝: 256-CSBGA(17x17)
包裝: 帶卷 (TR)
DS26324 3.3V, 16-Channel, E1/T1/J1 Short-Haul Line Interface Unit
36 of 120
5.9.3
Receive Pattern Detection
The Receive BERT receives only the payload data and synchronizes the receive pattern generator to the incoming
pattern. The receive pattern generator is a 32-bit shift register that shifts data from the least significant bit (LSB) or
bit 1 to the most significant bit (MSB) or bit 32. The input to bit 1 is the feedback. For a PRBS pattern (generating
polynomial x
n + xy + 1), the feedback is an XOR of bit n and bit y. For a repetitive pattern (length n), the feedback is
bit n. The values for n and y are individually programmable (1 to 32). The output of the receive pattern generator is
the feedback. If QRSS is enabled, the feedback is an XOR of bits 17 and 20, and the output will be forced to one if
the next 14 bits are all zeros. QRSS is programmable (on or off). For PRBS and QRSS patterns, the feedback will
be forced to one if bits 1 through 31 are all zeros. Depending on the type of pattern programmed, pattern detection
performs either PRBS synchronization or repetitive pattern synchronization.
5.9.3.1
Receive PRBS Synchronization
PRBS synchronization synchronizes the receive pattern generator to the incoming PRBS or QRSS pattern. The
receive pattern generator is synchronized by loading 32 data stream bits into the receive pattern generator, and
then checking the next 32 data stream bits. Synchronization is achieved if all 32 bits match the incoming pattern. If
at least six incoming bits in the current 64-bit window do not match the receive pattern generator, automatic pattern
re-synchronization is initiated. Automatic pattern re-synchronization can be disabled.
See Figure 5-13 for the PRBS synchronization diagram.
Figure 5-13. PRBS Synchronization State Diagram
Sync
Load
Verify
1 bit error
32 bits loaded
32
bi
ts
w
it
hout
e
rr
or
s
6 of
64
bi
ts
w
ith
e
rror
s
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