IPPOSPHYL2 Altera, IPPOSPHYL2 Datasheet - Page 50

• Manufacturer Part Number: IPPOSPHYL2
• Manufacturer: Altera

Specifications of IPPOSPHYL2

• Lead Free Status / RoHS Status: Not Compliant

3–22
POS-PHY Level 2 Interface
POS-PHY Level 2 and 3 Compiler User Guide
1
Figure 3–16. The renb Signal Behavior
Notes to
(1) The renb signal is sampled low—another read may take place.
(2) The renb signal is sampled high—all signals must stabilize and remain unchanged on the following
(3) The renb signal was sampled high on the previous rfclk rising edge—all signals must remain
(4) The renb signal remains high—all signals must remain unchanged.
(5) The renb signal is sampled low, therefore data may change on the next rfclk rising edge.
(6) Data on rdat[31:0] and all other signals may change.
According to the POS-PHY specifications, when renb is sampled low by the PHY
device, a read is performed from the receive FIFO buffer and the rdat[31:0] signals
are updated on the following rising edge of rfclk.
The interface direction is shown as either link to PHY, or PHY to link.
For a POS-PHY level 2 link-layer MegaCore function, the following applies:
■
■
For a POS-PHY level 2 PHY-layer MegaCore function, the following applies:
■
■
‘A’ interface signals are prefixed by a_; ‘B’ interface signals are prefixed by b1_, b2_,
and so on.
Table 3–11
Link to PHY results in an output port on the MegaCore function.
PHY to link results in an input port on the MegaCore function.
Link to PHY results in an input port on the MegaCore function.
PHY to link results in an output port on the MegaCore function.
rfclk rising edge.
unchanged. The MegaCore function uses this time to sample data from rdat[31:0]. The POS-PHY
specification allows data to be sampled anytime between 3 and 6 (3, 4, 5, or 6 are all valid).
Figure
rdat[31:0]
describes the POS-PHY level 2 transmit interface.
3–16:
renb
rfclk
(1)
Preliminary
(2)
(3)
(4)
© November 2009 Altera Corporation
Chapter 3: Functional Description
(5)
(6)
Interface Signals