IPPOSPHYL2 Altera, IPPOSPHYL2 Datasheet - Page 43

• Manufacturer Part Number: IPPOSPHYL2
• Manufacturer: Altera

Specifications of IPPOSPHYL2

• Lead Free Status / RoHS Status: Not Compliant

Chapter 3: Functional Description
Parameters
Address & Packet Available Settings
© November 2009 Altera Corporation
1
FIFO Buffer Size
The FIFO buffer size is automatically set to be as wide as the widest of the input and
the output port.
Each word in the FIFO buffer can only contain at most one packet. Where the FIFO
buffer width is N bytes, packets of 1 to N bytes in length occupy 1 FIFO buffer word.
So, a FIFO buffer of (M words × N bytes) can only hold M packets with a length of 1 to
N bytes.
The Atlantic interface always operates in direct (no addressing) mode.
POS-PHY Level 3 Interfaces
The POS-PHY level 3 interfaces can be multi- or single-channel.
multi-channel packet available mode options.
Table 3–5. Multi-Channel Packet Available Mode Options (POS-PHY Level 3)
Table 3–6
‘B’ interfaces always operate in direct mode.
Table 3–6. Single-Channel Packet Available Mode Options (POS-PHY Level 3)
POS-PHY Level 2 Interfaces
The POS-PHY level 2 interfaces can be multi- or single-channel.
multi-channel packet available mode options.
Direct
Polled
Polled (Ignore stpa) In the POS-PHY transmit direction the MegaCore function uses tadr and
Direct
Direct (No Addressing)
Option
Option
shows the multi-channel packet available mode options.
pin per supported channel. In the POS-PHY receive direction the MegaCore
function uses renb and rval to support all channels.
In the POS-PHY transmit direction the MegaCore function uses tadr,
ptpa, and stpa, to support all channels.
ptpa to support all channels. For compatibility with some POS-PHY
interfaces that do not support the functionality of the stpa pin, the stpa
signal is ignored and removed from the MegaCore function.
In the POS-PHY transmit direction the MegaCore function uses one dtpa
In the POS-PHY transmit direction the MegaCore function uses one
dtpa pin, and uses a tsx pin. In the POS-PHY receive direction the
MegaCore function uses renb and rval, and uses an rsx pin.
In the POS-PHY transmit direction the MegaCore function uses one
dtpa pin, and does not use a tsx pin. In the POS-PHY receive direction
the MegaCore function uses renb and rval, and does not use an rsx
pin.
Preliminary
Description
Description
POS-PHY Level 2 and 3 Compiler User Guide
Table 3–5
Table 3–7
shows the
shows the
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