10006024-04 Katana®752i User’s Manual 12-1

Section 12

Hot Swap
The Katana®752i baseboard incorporates a Linear Technologies LTC1643L HotSwap con-
troller device and is fully compliant with the CompactPCI (cPCI) Hot Swap Specification (see
references in Table1-2). Katana®752i circuit boards allow for High Avai lability Hot Swap sys-
tems, including cPCI/PSB systems (without a cPCI interface). Some basic Hot Swap features
include:
Ejector switch indication and Hot Swap LED control
Back-end voltage isolation using the BD_SEL* signal and power supply health indication
using the CPCI_HEALTHY* signal
Minimal capacitive loading on power supplies and I/O pins, according to the Hot Swap
Specification
In-rush current limiting

HOT SWAP LOGIC (HSL) PLD

The Katana®752i utilizes a programmable logic device, called the Hot Swap Logic (HSL)
PLD to store various registers that provide status and affect the operation of the board.
These registers are listed below.
Table 12-1: HSL PLD Register Summary
Address (Hex): Name: Description:
F821,0000 J4SGA Shelf Enumeration Bus pin status from J4 conn. (read only)
F821,0001 J4GA Geographical Address from J4 connector (read only)
F821,0002 J2GA Geographical Address from J2 connector (read only)
F821,0003 CT Clk Control CT clock control registers (see page13-3)
F821,0004 cPCI Status Bit 0, CT_EN signal: 0 = present, 1 = not present
Bit 1, cPCI present on backplane: 1 = yes, 0 = no
Bit 2, HSL_CPCI_N signal: 0 = cPCI, 1 = no cPCI
(remaining bits are zero, only used when cPCI is enabled)
F821,0005 reserved
F821,0006 HS LED Bit 0, Hot Swap LED control: 1 = LED on; 0 = LED off
(only used when cPCI is disabled)
F821,0007 reserved for HSL PLD version