Enum# Interrupt; Hotswap Control And Status Register / Statemachine - PEP CP390 Manual

CP390
4.2.4

ENUM# Interrupt

The onboard logic generates a low active interrupt signal to indicate that the board is
about to be extracted from the system or inserted into the system.
4.2.5

Hotswap Control and Status Register / Statemachine

All hotswap peripheral boards provide a HotSwap Control And Status Register which
provides information on the current state of the board. The defined bits in this register
set are named:
Table 4-1: Hotswap Control and Status Register / Statemachine
EXT
INS
LOO
EIM
Due to the fact that no 64-bit transparent PCI-to-PCI bridge currently exists, which
would provide built-in hotswap status registers, another way of implementing these bits
had to be found.
The solution, therefore, is to put this information into the onboard logic.
Since on-chip registers handle read and write accesses in the same way, it is necessary
to exercise care when configuring the PCI-to-PCI GPIOs (general purpose IOs).
Table 4-2: Hotswap Register Bits
EXT
INS
LOO
EIM
Attention!
!
GPIO[2:3] have to be configured as inputs. A different configura-
tion may damage your bridge device.
ID 19976, Rev. 0200
Bit Name
Bit Name
® PEP Modular Computers GmbH
Function
Indication of extraction process
Indication of insertion process
Led on
ENUM mask bit
Signal on 21150
GPIO[2]
GPIO[3]
GPIO[0]
GPIO[1]
Hotswap
Page 4 - 5