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P5040/P5020 Reference Design Board User Guide, Rev. 0
10
Freescale Semiconductor
Architecture
The following summarizes the use of MECC pins on the P5040/P5020RDB:
•
RDB does not directly support MECC pin usage to access internal debug information. Since the
RDB does not provide a dedicated MUX, it has simpler routing and signal integrity status.
•
However, as the RDB does not interfere with the controller-to-DDR path, access to debug
information on MECC pins is possible by using a NextWave (or equivalent) DDR logic analyzer
connector and non-ECC DDR modules.
5.1.2
SerDes x20/x18 Interface
The SerDes block on the P5040/P5020 provides high-speed serial communications interfaces for several
internal devices. The SerDes block provides 20 or 18 serial lanes for the P5040 or P5020, respectively.
They may be partitioned as shown in
(a) or (b), respectively.
Note that the term ‘lane’ is used to describe the minimum number of signals needed to create a
bidirectional communications channel; in the case of PCI-Express or Serial RapidIO, a lane consists of two
differential pairs, one for receive and one for transmit, or four in all.
, top down, shows the following clocking banks and how they are configured by the reference
board:
Bank1
Lanes A–D go to x4 slot 1, E is demuxed to either x1 slot 2 or combined with lanes
E-F to support 4 SGMII ports, and I–J to the Aurora debug connector
Bank2
Lanes A–D go to port 1 of dual-ported XAUI PHY
Bank3
Lanes A–B of P5040 goes to port 2 of dual-ported XAUI PHY while lanes C and
D of P5020 could be demuxed to either go to SATA ports 1 and 2 or go to port 2
of dual-ported XAUI PHY.
Bank 4
Lanes P1B and P2A of P5040 are muxed are with lanes C–D of P5020 to SATA
ports 1 and 2.
Table 5. P5040/P5020 SerDes Lane Multiplexing Configurations on P5040/P5020
Bank 1
Bank 2
Bank 3
Bank
4
A
B
C
D
E
F
G
H
I
J
A
B
C
D
A
B
C
D
P1B
P2A
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
— —
SLOT 1
SLOT 2
Aurora Conn on
SLOT 3
SATA
Port1
SATA
Port2
—
—
— —
P5040 (RCW 02 and 34)
PCIe1
(5/2.5G)
PCIe2
(5/2.5G)
Debug (5/2.5G)
XAUI FM1
XAUI FM2
SA
T
A
1
SA
T
A
2
PCIe1
(5/2.5G)
SGMII
FM2
SGMII
FM2
SGMII
FM2
SGMII
FM2
Debug (5/2.5G)
XAUI FM2
—
—
SAT
A1
SAT
A2
— —
P5020 (RCW 34 and 35)