ep1agx50d Altera Corporation, ep1agx50d Datasheet - Page 15
ep1agx50d
Manufacturer Part Number
ep1agx50d
Description
Arria Gx Device Data Sheet
Manufacturer
Altera Corporation
Datasheet
1.EP1AGX50D.pdf
(296 pages)
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Figure 2–5. Byte Serializer Operation
Note to
(1)
Altera Corporation
May 2008
datain[15:0]
dataout[7:0]
datain may be 16 or 20 bits. dataout may be 8 or 10 bits.
Figure
2–5:
f
xxxxxxxxxx
The transmitter PLL output feeds the central clock divider block and the
local clock divider blocks. These clock divider blocks divide the
high-speed serial clock to generate the low-speed parallel clock for the
transceiver PCS logic and PLD-transceiver interface clock.
Transmitter Phase Compensation FIFO Buffer
A transmitter phase compensation FIFO is located at each transmitter
channel’s logic array interface. It compensates for the phase difference
between the transmitter PCS clock and the local PLD clock. The
transmitter phase compensation FIFO is used in all supported functional
modes. The transmitter phase compensation FIFO buffer is eight words
deep in PCI Express (PIPE) mode and four words deep in all other modes.
For more details about architecture and clocking, refer to the
Transceiver Architecture
Handbook.
Byte Serializer
The byte serializer takes in two-byte wide data from the transmitter phase
compensation FIFO buffer and serializes it into a one-byte wide data at
twice the speed. The transmit data path after the byte serializer is 8 or 10
bits. This allows clocking the PLD-transceiver interface at half the speed
as compared to the transmitter PCS logic. The byte serializer is bypassed
in GIGE mode. After serialization, the byte serializer transmits the least
significant byte (LSByte) first and the most significant byte (MSByte) last.
Figure 2–5
input to the byte serializer from the transmitter phase compensation
FIFO; dataout[7:0] is the output of the byte serializer.
{8'h00,8'h01}
D1
Note (1)
xxxxxxxxxx
shows byte serializer input and output. datain[15:0] is the
8'h01
chapter in volume 2 of the Arria GX Device
D1
{8'h02,8'h03}
LSByte
D2
8'h00
D1
Arria GX Device Handbook, Volume 1
MSByte
8'h03
D2
LSByte
xxxx
Arria GX Architecture
D3
8'h02
D2
Arria GX
MSByte
2–7
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