參數(shù)資料
型號： STS1FRM
元件分類： 通信、網(wǎng)絡模塊及開發(fā)工具
英文描述： Telecomm/Datacomm
中文描述： 電信/數(shù)據(jù)通信
文件頁數(shù)： 3/6頁
文件大小： 157K
代理商： STS1FRM
Altera Corporation
3
SONET STS-1 Framer MegaCore Function (STS1FRM) Data Sheet
I
Path overhead transmitter (TXPOH_0)
–
Inputs payload data
–
Allows the flexible insertion of the POH by software, or by
parameterized hardware
–
Generates parity bytes
–
Maintains counters and buffers
Interfaces &
Protocols
Two interfaces support the STS1FRM: the middle interface (Midbus), and
the access to internal registers (AIRbus) interface.
Midbus
The Midbus interface is a simple synchronous full-duplex data path bus.
The STS1FRM Midbus runs at 6.48 MHz over a single byte lane in each
direction. In the receive (RX) direction, data is transferred from the
Midbus master (RXPOH_0) to the slave. In the transmit (TX) direction,
data is transferred from the slave to the master (TXPOH_0). In each
direction, RX and TX, the Midbus can carry eight bits per clock cycle. It
includes Midbus receive data (
mrxdat_0[7:0])
and Midbus receive
enable
(mrxena_0)
lines to indicate valid data transfers in the RX
direction, and Midbus transmit data (
mtxdat_0[7:0])
and Midbus data
enable
(mtxena_0)
lines to indicate valid data requests in the TX
direction.
AIRbus
The AIRbus interface provides access to internal registers using a simple
synchronous internal bus protocol. This consists of separate read data
(
rdata[31:0]
) and write data (
wdata[31:0]
) buses, a data transfer
acknowledge (
dtack
) signal, and a block select (
sel
) signal. An address
(
addr[11:2]
) 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. In
the STS1FRM the AIRbus has a data width of 32 bits.
More detailed information on the Midbus, and AIRbus is available from
http://www.altera.com/IPmegastore
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