Shelf Manager ACB-VI
IPMB
8
R1.2, March 2018
3 IPMB
3.1 Bused IPMB Interface (Product Number: 21990-401)
The ShMM-700R provides two IPMBs. The IPMB-A and IPMB-B from the ShMM-700R are
routed to the Backplane connector through I2c buffers. The ATCA Backplane buses the two
IPMBs to the ATCA boards.
The Active# signal of the ShMM-700R is used to switch on/off the pull-up resistors of the
IPMBs.
Figure 4: Block diagram bused IPMB
3.2 Radial IPMB Interface (Product Number: 21990-402)
Radial IPMB is implemented by 2 FPGAs connected to the Serial Peripheral Interfaces (SPI) on
the ShMM700R.
Figure 5: Block diagram radial IPMB
7
R
Enable
Ready
Enable
Ready
LTC
4300
LTC
4300
ShMM-700R
SPI_A
SPI_B
3.3 V
.....
.....
.....
FPGA 1
IBMB_A 1
Radial_B_Enable
Radial_A_Enable
Cross_B_Enable
Cross_B_Enable
IBMB_A 16
.....
.....
FPGA 2
IBMB_B 1
IBMB_B 16
IBMB_B Cross
IBMB_A Cross
.....
Backplane Connector