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參數(shù)資料
| 型號： | PP155 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 15/31頁 |
| 文件大?。?/td> | 600K |
| 代理商： | PP155 |
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Altera Corporation
15
PPP Packet Processor 155 Mbps MegaCore Function (PP155) User Guide
Specifications
S
1
AIRbus
The AIRbus interface provides access to internal registers using a simple
synchronous internal bus protocol. This consists of separate read data
(
rdata[15:0]
) and write data (
wdata[15:0]
) buses, a data transfer
acknowledge (
dtack
) signal, and a select (
sel
) signal. An address
(
addr[4:1]
) bus and read (
read
) signal indicate the location and type of
access within the block. The
rdata
buses and
dtack
signals can be
merged from multiple blocks using a simple OR function. The
dtack
signal is sustained until the block
sel
is removed (four-way
handshaking) meaning the AIRbus can cross clock domain boundaries.
The PP155 is an AIRbus slave with a data width of 16 bits.
Atlantic
The Atlantic interface is a full-duplex synchronous bus protocol
supporting both packets and cells. The PP155 is an Atlantic interface
master using an 8-bit wide data path, clocked at 19.44 MHz, to deliver
packets to the slave.
1
The arxdav, atxdiv, and atxsop signals are provided, but are not
used.
f
More detailed information on the Midbus, AIRbus, and Atlantic is
http://www.altera.com/IPmegastore.
Data Ordering
Data is transferred in parallel (8 bits at a time) in the same order it was
received internally between the PP155 and the interfaces, but it is
ultimately transmitted/ received MSb first through external bit-serial
mediums such as SONET and SDH (optical fibre), in keeping with
telephony convention.
This convention of MSb first is not followed in doing CRC
(FCS/ syndrome) calculations, which use data communications LSb first
conventions. In CRC calculations, the LSb of each octet is nominally
processed first. CRC calculations are actually done in parallel though the
calculation simulates a bit-serial LSb first calculation. The order that octets
go into the CRC calculation is the same as the transmission order. The
difference in ordering has no practical effect as long as both ends follow
the same convention.
1
It is important to specify the nominal order within the bits on the
Atlantic and Midbus interfaces.
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