Xilinx Zynq-7000 User Manual page 330

PHY Control Block
The QDR PHY uses the PHY Control block to interface to the OUT_FIFOs and
PHASER_OUT_PHY. The PHY Control block helps to prevent the condition where one or
more of the OUT_FIFOs are operating close to the EMPTY condition of the OUT_FIFO, which
could potentially make the OUT_FIFO go EMPTY (based on how the WRCLK and RDCLK are
aligned at the OUT_FIFO over voltage-temperature variations) thereby causing the
OUT_FIFO to stall. The PHY Control block helps the OUT_FIFO to operate closer to the FULL
condition of the OUT_FIFO.
The steps required for the initialization are as follows:
1. After PHY_CONTROL_READY is asserted, PHY_CONTROL is programmed with a large
delay into the pc_phy_counters. The control word format is shown in
Table 2-11.
Table 2-10: Control Word Format
Bits 35:32 31
Major Minor
Field AO1
OP OP
Table 2-11: Control Word Decode
MajorOP MinorOP
0 – REG
0–REGPRE
1 – PRE
1–ACTRDWR ACT
Zynq-7000 AP SoC and 7 Series FPGAs MIS v4.1
UG586 November 30, 2016
30 29:25 24:23 22:17 16:15
Event Data
Seq
Delay Offset
EventDelay IndexHi
IndexHi[16] =
Register Data[5]
Register Data[4:0]
IndexHi[15] =
Register Addr[3]
5'b000xx – STALL DC
5'b010xx – REF Rank
5'b100xx – PREBANK Rank
5'b110xx – PREALL Rank
All others – NOP DC
29:28: ACT Slot
27: AP Rank
26:25: RDWR Slot
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Chapter 2: QDR II+ Memory Interface Solution
14:12 11:8
IndexHi IndexLo
AO0
(Rank) (Bank)
IndexLo
Register
Address Bits
[2:0]
DC
DC
Bank
DC
DC
Bank
Table 2-10 and
7:3 2 1 0
Command Non-
Read Data
Offset Data
Registers
4'b0000–4'b0011: Reserved
4'b0100: CTLCORR
4'b0101: RRDCNTR
4'b0110: REF2ACT
4'b0111: TFAW
4'b1000: A2ARD
4'b1001: A2AWR
4'b1010: PRE2ACT
4'b1011: ACT2PRE
4'b1100: RDA2ACT
4'b1101: RD2PRE
4'b1110: WRA2ACT
4'b1111: WR2PRE
The STALL operation delays the
issue of the Ready signal from
pc_phy_counters to the
sequencing state machines.
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