Bkcu-Ex1 - Sony BCU-100 Maintenance Manual

7. Power supply
Power ON/OFF sequence
Each of the various devices on the BE board have their
own DC/DC regulator or linear regulator, so the
devices can be turned on or off with controls from the
SYSCON. ON/OFF is controlled by the sw-n signal,
and devices are turned ON in increasing number order
and OFF in decreasing number order. sw-0 is the ON/
OFF signal for the power supply unit.
RE-255 board
The RE-255 board is a DC-DC converter block, and +12 V
input from the power supply unit is converted to +3.3 V or
+5 V and output.
1. Input voltage monitoring circuit
VOLTAGE DETECT (IC3) monitors the input voltage. If
the input voltage is higher than the startup voltage, power
is supplied to each controller IC (IC5, 6) or the REF
voltage IC (IC9). It continues to operate after being started
up once until the input falls below the cutoff voltage.
2. Output protection circuit
Protection circuits are included for the +3.3 V and +5 V
output. If an error occurs in the output of either system or
if some kind of error prevents output, the H_SHUTDOWN
signal is output from IC7. The H_SHUTDOWN signal
stops output for both +3.3 V and +5 V. Q1 turns on with
the H_SHUTDOWN signal, PWR OK output becomes
"L", and a signal signifying that Power FAIL has occurred
is sent to the BE board.
. Output overcurrent (short-circuit) protection
. Output overvoltage protection
. Output undervoltage protection
3. Voltage control circuit
Feedback control is applied to +3.3 V with IC5 and to +5
V with IC6 for increased stabilization. The output current
for +3.3 V is very large, so 2-phase circuit is used. Also,
the synchronous rectification method is used on both +3.3
V and +5 V in order to improve the efficiency.
1-16 (E)

1-8-2. BKCU-EX1

BKCU-EX1 is an optional adapter to expand memory in
BCU-100 and is constructed on the MEM-122 board or
MEM-126 board. When used in combination with the
BKCU-MY8D memory module (8 GB), the BCU-100
memory can be expanded by 8 GB.
MEM-122/MEM-126 board
The MEM-122/MEM-126 board has the following main
functions.
. Power supply generation (Including supplying the power
supply to the memory module)
. FPGA configuration function (Including the upgrade
function)
. PCI-Express control
. Memory module (DDR2 DIMM) control
The power supply generates +3.3 V/+2.5 V/+1.8 V/+1.5
V/+1.2 V (MEM-122 board)/+1.0 V (MEM-126 board)
from the +12 V that is supplied from the BE-28 board on
BCU-100, and +1.8V is supplied to the memory module.
A terminating power supply is also generated at +1.25 V/
+0.9 V. BCU-100 is connected via the card edge connector
CN1, and the memory module is connected via CN2/CN3.
Signals and power supplies are supplied via these connec-
tors.
CN1 connecting to BCU-100 is a x 16 card edge connector
with PCI-Express specifications. Of these, 4 lanes are used.
CN2/CN3 connecting the memory module is a 240-pin
connector and it can attach to two 2 GB or 4 GB Regis-
tered memory module with ECC (error correction code).
The two attached modules must have the same specifica-
tions. Memory data on PCI-Express that is input/output via
CN1 is converted into PIPE (PHY Interface for the PCI-
Express Architecture) with PCI-Express PHY IC (IC208)
and handed over to FPGA (IC1). FPGA consists mainly of
the PCI process block and the DRAM control block.
The data from IC208 undergoes a PCI process, and then is
written into the memory module via the DRAM control
block. The data is read in the same way. ECC is processed
in the DRAM control block. FPGA configuration data is
stored in FlashROM (IC900). Normal operations data
(BANK1) is written in IC900 along with backup data
(BANK0). The BANK0 data cannot be updated, but the
BANK1 data can be updated with upgrades and other
changes. Refreshing the FPGA configuration or BANK1
data can be controlled with PLD (IC2). IC2 data is stored
in SerialROM (IC901) and cannot be updated.
Control from the BCU-100 is mainly performed via the
PCI-Express signal, but status monitoring can be per-
formed via SM BUS. This monitoring is performed from
the SYSCON, and logs can be gathered for situations such
as problems with operations.
BCU-100 MM