参数资料
型号: XRT91L80IB
厂商: Exar Corporation
文件页数: 21/46页
文件大小: 0K
描述: IC TXRX SONET/SDH 4BIT 196STBGA
产品变化通告: XRT91L80IB Obsolescence 6/Sept/2010
标准包装: 126
类型: 收发器
规程: SONET/SDH
电源电压: 3.3V
安装类型: 表面贴装
封装/外壳: 196-LFBGA
供应商设备封装: 196-STBGA(12x12)
包装: 托盘
XRT91L80
xr
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
REV. 1.0.0
20
device will set the OVERFLOW pin to a "High" level and will automatically reset and center the FIFO. Figure 11
provides a detailed overview of the transmit FIFO in a system interface.
FIGURE 11. TRANSMIT FIFO AND SYSTEM INTERFACE
3.4
FIFO Calibration Upon Power Up
It is required that the FIFO_RST pin be pulled "High" for 2 TXPCLKOP/N cycles to flush out the FIFO after the
device is powered on. If the FIFO experiences an Overflow condition, FIFO_RST can be used to manually
reset the FIFO. However, the STS-48/STM-16 transceiver has an automatic reset pin that will allow the FIFO to
automatically reset upon an Overflow condition. FIFO_AUTORST should be pulled "High" to enable the
automatic FIFO reset function.
3.5
Transmit Parallel Input to Serial Output (PISO)
The PISO is used to convert 622.08/666.51 MHz parallel data input to 2.488/2.666 Gbps serial data output
which can interface to an optical module. The PISO bit interleaves parallel data input into a serial bit stream
taking the first bit from TXDI3P/N, then the first bit from TXDI2P/N, and so on as shown in Figure 12.
FIGURE 12. SIMPLIFIED BLOCK DIAGRAM OF PISO
Write Pointer
Read Pointer
AUTORST
OVERFLOW
RESET
TXPCLKIP/N
REFCLKP/N
FIFO Control
Div by 4
2.488/2.666 GHz PLL
CMU
delay
Upstream Device
4 x 9 FIFO
XRT91L80
TXPCLKOP/N
4
TXDI[3:0]P/N
4
b00
b01
b02
b03
b04
b05
b06
b07
b10
b11
b12
b13
b14
b15
b16
b17
b20
b21
b22
b23
b24
b25
b26
b27
b30
b31
b32
b33
b34
b35
b36
b37
4-bit Parallel LVDS Data Input
TXDI0P/N
TXDI3P/N
TXDI2P/N
TXDI1P/N
TXOP/N
TXPCLKIP/N
622.08/666.51 MHz
2.488/2.666 Gbps
b00
b10
b20
b30
b01
b11
b21
b31
b02
b12
b22
b32
b03
b13
b23
b33
P
IS
O
time (0)
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