![](http://datasheet.mmic.net.cn/370000/STDM110_datasheet_16733661/STDM110_637.png)
STDM110
4-76
Samsung ASIC
PCI BUFFERS
Overview
PCI buffers are designed for PCI local bus application which is intended for high-performance 32-bit or 64-bit
bus architecture.
Samsung supports PCI input, output and bi-directional buffers for 3.3V and 5V signaling environment.
Features
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0.24
μ
m, low-power, high performance CMOS Technology
Input, output, and bi-directional PCI buffers
PCI local bus specification rev2.2 compliant
Operating at up to 66MHz, including 33MHz
Electrically compliant interface in 3.3V and 5V bus environments
Description
These PCI buffers are designed for 3.3V and 5V environments. These buffers are compliant with the PCI
local bus specification rev2.2. The PCI buffers for 66MHz can be available in 33MHz interface, but require
more power pads due to their fast and noisy characteristics. The 5V tolerant PCI buffers can be used for
33MHz, 5V environment. These tolerant PCI buffers require 5V power for bulk of PMOS driver for 5V bus
environment or 3.3V power for 3.3V environment. The 5V tolerant PCI drivers support 5V environment while
EN5V is low. Although tolerant PCI buffers support 5V environment, they do not drive 5V.
NOTE:
If you want to use PCI buffers, please contact SEC.
Cell List
NOTE1:
3.3V signaling conditions: EN5V=high, VIO=3.3V, 5V tolerant is not supported.
5V signaling conditions: EN5V=low, VIO=5V, and 5V tolerant is supported.
NOTE2:
In 3.3V signaling, VIO is 3.3V, which is provided through the vdd5o_pci power cell.
In 5V signaling, VIO is 5V, which is provided through the vdd5o_pci power cell.
Cell Name
Description
Operating Frequency
Operating
Voltage
PTBPCI
bi-direction
Up to 33MHz at 5V signaling
(note1)
Up to 66MHz at 3.3V signaling
3.3V
PTOPCI
driver
Up to 33MHz at 5V signaling
Up to 66MHz at 3.3V signaling
PTIPCI
receiver
Up to 33MHz at 5V signaling
Up to 66MHz at 3.3V signaling
Power Cell Name
VDD1I_PCI
VDD3OP_PCI
VDD5O_PCI
VSSI_PCI
VSSOP_PCI
Description
1.8V Power cell for internal core and PCI I/Os
3.3V Power cell for PCI I/Os
VIO(3.3V or 5V) Power cell for PCI I/Os
(note2)
Gnd Power cell for internal core; not used for PCI I/Os
Gnd Power cell for PCI I/Os