參數(shù)資料
型號: QLU22108-PT280C
英文描述: Telecommunication IC
中文描述: 通信集成電路
文件頁數(shù): 13/21頁
文件大?。?/td> 238K
代理商: QLU22108-PT280C
QLU22108-PT280C Device Data Sheet
13
QLU22108-PT280C Device Data Sheet
7.3 Utopia Interface MPHY Transmit (L2)
When operating in MPHY mode, the Master checks, (Typically in a round robin fashion)
the status of all the Slave ports. Two options are defined by the Utopia standard:
Polled status indication with all the PHY ports using a shared single CLAV signal to
report their status to the Master
Direct status indication with one CLAV implemented per PHY port or per Utopia group.
In MPHY mode only one transmit PHY port is selected at a time for data transfers but the
Master continuously polls the status of the Slave's other PHY ports.
The Bridge implements the second approach, using direct status indication.
7.3.1 MPHY Operation with Direct Status
For each PHY port, a status signal
ut_txclav
is permanently available. The Utopia Bus
then supports up to four PHY ports, each using one CLAV signal (Slave port
ut_txclav_dir(n)
).
For each port independently,
ut_txclav_dir(n)
is asserted when enough space is
available for a complete cell in the port FIFO 1 and
ut_txclav_dir(n)
is de-asserted
when the corresponding port FIFO cannot receive the subsequent cell
2
.
Status signals and cell transfers are independent of each other for each port. No address
information is needed to obtain status information. Address information must be valid only
for selecting a PHY port prior to one or multiple cell transfers. To select a port, the Master
de-asserts
ut_txenb
3
, puts address port on
ut_txaddr(4:0)
4
, the port is selected
by the Slave when
ut_txenb
goes low (Re-asserted by the Master)
5
.
Figure 10: MPHY Transmit - Direct Status Indication
As defined for single CLAV Utopia Transmit, the Master can pause a transfer and implicitly
re-select a PHY port.
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