HC4GX15 Datasheet, PDF (392/668 Pages) Altera Corporation – HardCopy IV Device Handbook

1–128
Chapter 1: HardCopy IV GX Transceiver Architecture
Functional Modes
PCI Express (PIPE) Mode Datapath
Figure 1–106 shows the HardCopy IV GX transceiver datapath when configured in
PCI Express (PIPE) functional mode.
Figure 1–106. HardCopy IV GX Transceiver Datapath in PCI Express (PIPE) ×1 Mode
Core
Fabric
tx_coreclk[0]
PCI
Express
hardIP
Core Fabric-Transceiver
Interface Clock
rx_coreclk[0]
PCI
Express
hardIP
PIPE
Interface
PIPE
Interface
TX Phase
Compensation
FIFO
wrclk
rdclk
tx_clkout[0]
Transmitter Channel PCS
Byte
Serializer
wrclk
rdclk
8B/10B
Encoder
/2
Low-Speed Parallel Clock
RX Phase
Compensation
FIFO
Byte De-
serializer
Receiver Channel PCS
8B/10B
Decoder
Rate
Match
FIFO
Word
Aligner
Parallel
Recovered Clock
/2
Low-Speed Parallel Clock
Transmitter Channel PMA
Serializer
High-Speed
Serial Clock
Receiver Channel PMA
De-
Serializer
CDR
Table 1–31 shows the transceiver datapath clock frequencies in PIPE functional mode
configured using the ALTGX MegaWizard Plug-In Manager.
Table 1–31. HardCopy IV GX Transceiver Datapath Clock Frequencies in PCI Express (PIPE) Mode
Functional Mode
Data Rate
High-Speed Serial
Clock Frequency
Parallel Recovered
Clock and
Low-Speed
Parallel Clock
Frequency
Core Fabric-Transceiver
Interface Clock Frequency
Without Byte
Serializer/
Deserializer
(8-Bit Wide)
With Byte
Serializer/
Deserializer
(16-Bit Wide)
PCI Express (PIPE) ×1,
×4, ×8
(Gen1)
2.5 Gbps
1.25 GHz
250 MHz
250 MHz
125 MHz
PCI Express (PIPE) ×1,
×4, ×8
(Gen2)
5 Gbps
2.5 GHz
500 MHz
N/A (1)
250 MHz
Note to Table 1–31:
(1) In PCI Express (PIPE) functional mode at Gen2 (5 Gbps) data rate, the byte serializer/deserializer cannot be bypassed.
Transceiver datapath clocking varies between non-bonded (×1) and bonded (×4 and
×8) configurations in PIPE mode.
The transmitter datapath in PCI Express (PIPE) mode consists of:
■ PCI Express (PIPE) interface
■ Transmitter phase compensation FIFO
HardCopy IV Device Handbook Volume 3
© June 2009 Altera Corporation