TAHOE 8724 User Guide
Rev: 01
8/10/2017
Page 17 OF 45
Interface Masters Technologies Inc. Confidential & Proprietary
2.1.6
SERDES (QLMs)
The CN78XX has eight Quad Lane Modules (QLM), with each consisting of Four
SERDES that can be configured as different interfaces, such as SGMII, XAUI, RXAUI,
XFI/KR, XLAUI, or PCI-e.
The TAHOE 8724 QLMs are configured as follows:
a)
QLM0 – PCI-e 3.0 x4
b)
QLM1 – SGMII x1
c)
QLM2 – RXAUI x2
d)
QLM3 – RXAUI x2
e)
QLM4 – XFI/KR x4 or XLAUI x1
f)
QLM5 – XFI/KR x4 or XLAUI x1
g)
QLM6 – XFI/KR x4 or XLAUI x1
h)
QLM7 – XFI/KR x4 or XLAUI x1
a.
QLM0 is configured as PIC-e 3.0 RC interface to connect with PEX8724 PCI-e
switch.
b.
QLM1 is configured as SGMII interface to connect with a GE PHY VSC8221 to
provide the management port.
c.
QLM2/3 is configured as RXAUI interface to connect with CS4318 Quad RAXUI
to SFI PHY to provide four SFP+ ports.
d.
QLM4/5/6/7 is configured as XFI or XLAUI interface to connect with the PHY on
the IO module.
