Specifications

4
Components and Subsystems
46
Update channel connections to the AMC bay
Theupdatechannelonthebackplanehasbothfast(channel0)andslow(channel4)
connectionstotheAMCbay.BothupdatechannelsareusedtoconnecttwoCPMs
(installedinchassisslotslinkedbythePICMGupdatechannel).Refertotheentriesfor
AMCports12and13inTable 8forafunctionaldescriptionoftheupdatechannels.
Theslowpathupdatechannel(AMCport13)providesameanstopassrelativelyslowdata
betweenredundantAMCmodulesondifferentCPMs,asillustratedinFigure 9.
Figure 9. AMC bay slow path update channel
Extended options Fabric port 15 Port 15 of the AMC bay connects through the Zone 3 J30 connector to the RTM. These
interconnections are to provide an I
2
C bus from the AMC module to the RTM for SFP and LED
control. They also provide a serial port for RTM access to the AMC for debug.
Per the AMC.0 specification, AMC modules are required to power up with their ports disabled if the
signal levels used are non-LVDS. This is the case for the I
2
C interface and its pull-ups on the AMC
module. The RTM must also have an I
2
C bus isolator. The TTL-level serial port signals on the AMC
must also power up disabled.
The E-Keying function is provided by software on the CPM's IPMC and the AMC module's MMC
(module management controller) working together to determine whether the ports are enabled. No
hardware buffer is provided for the port on CPM.
Extended options Fabric ports 17, 18,
19, and 20
Ports 17, 18, 19 and 20 connect through the Zone 3 J31 connector to the RTM. These
interconnections are to provide four 1.25 Gbps differential SerDes or SGMII channels between the
AMC module and the RTM.
Per the AMC.0 specification, AMC modules are required to power up with their ports disabled if the
signal levels used are non-LVDS. The E-Keying function is provided by software on the CPM's
IPMC and the AMC module's MMC working together to determine whether the ports are enabled.
No hardware buffers are provided for the ports on CPM.
Table 8. AMC port interfaces (continued)
Identity Function
BackplaneCPM
AMC
CPU
MMC
IPMC
CPM
AMC
CPU
MMC
IPMC
Port 13
RX0+
RX0-
TX0+
TX0-
E-Key
GPO1
GPO2
GPI1 or INT1
GPI2 or INT2
E-Key
Port 13
RX0+
RX0-
TX0+
TX0-
GPO1
GPO2
GPI1 or INT1
GPI2 or INT2
E-Key
E-Key