PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
CLAV signal will not be asserted again until the device is ready to accept an entire cell. If the
FIFO is filling, TPHY_CLAV will be deasserted when there is room for only four more bytes of
data. See Figure 29 and Figure 30 for the RUTOPIA transfer timing diagrams.
TPHY_CLK(i)
TPHY_ADDR(i)*
TPHY_CLAV(o)**
TPHY_CLAV***
TPHY_DATA(i)
D1
D2
D3
D
TPHY_SOC(i)
/TPHY_EN(i)
* Only used in MPHY mode
** For MPHY mode
*** For SPHY mode
Figure 29. RUTOPIA Start-of-Transfer Timing
TPHY_CLK(i)
TPHY_ADDR(i)*
TPHY_CLAV(o)**
TPHY_CLAV***
TPHY_SOC
TPHY_DATA(i)
/TPHY_EN(i)
D47
D48
D49
D50
D51
D52
D53
* Only used in MPHY mode
** For MPHY mode
*** For SPHY mode
Figure 30. RUTOPIA End-of-Transfer Timing
3.6 Receive Adaptation Layer Processor (RALP)
The RALP moves data from the receive FIFO ATM cells in the RUTOPIA interface block to the
external memory. The RALP does not verify the HEC because it expects a PHY layer device to
verify the HEC before presenting the cell to the AAL1gator II.
If SHIFT_VCI = 0, cells received with VCI(8) = 0 or Payload Type Indicator (PTI) = 4 to 7 are
sent to the OAM queue and are stored using the pointers located in the OAM receive queue table.
The head pointer is the address to the first cell received for each queue, and is usually maintained
ꢃꢅ
PMC [ PMC-SIERRA, INC ]
