PM7311 pmc-sierra, PM7311 Datasheet - Page 38

• Manufacturer Part Number: PM7311
• Description: Freedm 84a1024l Assp Telecom Standard Datasheet
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2021832, Issue 2
Pin Name
RPA
RENB
Type
Output
Input
Tristate
Pin
No.
AE1
AD4
FREEDM 84A1024L ASSP Telecom Standard Product Data Sheet
Function
FREEDM 84A1024L device for receive data available in any
one of its 1024 Any-PHY channels. Polling results are
returned on the RPA tristate output. During selection, the
address on the RXADDR[3:0] signals is qualified with the
RENB signal to select a FREEDM 84A1024L device enabling
it to output data on the receive APPI. Note that up to fifteen
FREEDM 84A1024L devices may share a single external
controller (one address is reserved as a null address). The Rx
APPI of each FREEDM 84A1024L device is identified by the
device base address in the RAPI-12 Base Address register.
The RXADDR[3:0] signals are sampled on the rising edge of
RXCLK.
Any-PHY Level 3 Mode:
RXADDR is not used as the interface is point-to-point.
The receive packet/fragment available signal (RPA) reflects
the status of a poll on the receive APPI of a FREEDM
84A1024L device.
RPA is tristate during reset and when a device address other
than the FREEDM 84A1024L’s device base address is
provided on RXADDR[3:0].
An FREEDM 84A1024L device must not be selected for
receive data transfer unless it has been polled and responded
that it has data ready to transfer.
When the RXADDR[3:0] inputs match the device base
address in the RAPI-12 Base Address register, that FREEDM
84A1024L device drives RPA one RXCLK cycle after sampling
RXADDR[3:0].
RPA is updated on the rising edge of RXCLK.
Any-PHY Level 2 Packet Mode:
When RPA is set high, the polled FREEDM 84A1024L still has
sufficient data to undertake another Any-PHY transfer. When
RPA is set low, the polled FREEDM 84A1024L device does
not have data ready to transfer.
Any-PHY Level 3 Mode:
RPA is not used and is tri-stated.
The receive enable signal (RENB) is used to throttle the
FREEDM 84A1024L.
RENB is sampled on the rising edge of RXCLK.
To commence data transfer, RENB must be sampled low.
Any-PHY Level 2 Mode:
The receive enable signal (RENB) qualifies the RXADDR[3:0]
signals for selection of a FREEDM 84A1024L device. When
RENB is sampled high and then low in consecutive RXCLK
cycles, the address on RXADDR[3:0] during the cycle when
RENB is sampled high selects a FREEDM 84A1024L device
enabling it to output data on the receive APPI. The Rx APPI
of each FREEDM 84A1024L device is identified by the device
base address in the RAPI-12 Base Address register.
RENB may also be used to throttle the FREEDM 84A1024L
during data transfer on the Rx APPI. When the FREEDM
84A1024L samples RENB high during data transfer, the
Released
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