19
Chapter 1: Introduction
Figure 1-6. Intel PCH C621 Chipset: System Block Diagram
Note: This is a general block diagram and may not exactly represent the features on your
motherboard.
System Block Diagram
SPI
FRONT PANEL
SYSTEM POWER
CTRL
FAN SPEED
#7 USB2.0
PCH
6.0 Gb/S
USB 2.0
USB
#1
#0
SATA
#3
#2
Temp Sensor
W83773 at SMBUS
SPI
AST2500
BMC
BMC Boot Flash
DDR4
SLOT 3
5+1 PHASE
205W
DDRIV
2133/2666
P1
P1
P0
VR13
P0
#G-1
DDRIV
2133/2666
#B-1
#A-1
UPI
PCI-E X16
DMI3 DMI3
UPI 10.4G/11.2G
5+1 PHASE
205W
VR13
#H-1
#J-1
#K-1
#L-1
#M-1
VCCP1 12vVCCP0 12v
UPI
PECI:30 PECI:31
SOCKET ID:0 SOCKET ID:1
#C-1
#D-1
#E-1
#F-1
UPI
P2P2
SLOT 4
PCI-E X16
SLOT 1
PCI-E X16
SLOT 2
PCI-E X16
CPU1 PCIe X16
CPU2 PCIe X16
SLOT 5
PCI-E X16 G3 (RSC-GR-6-X)
PCI-E X16 G3 (RSC-GR-6-X)
PCI-E X16 G3 (RSC-GR-6-X)
PCI-E X16 G3 (RSC-G-A6 or RSC-G-A66-X1)
PCI-E X16 G3
PCI-E X16 G3 with re-driver
AOM-PIO-i2XT
RMII/NCSI
VGA
COM PORT
RGRMII
Rear IO
riser card
PCI-E X4 G2
#0-3
USB3.0 x2
#0/1 USB2.0
PCI-E X4 G2
#5
ESPI
Debug Card
TPM HEADER
SPI
BIOS
Bus S/W
#3 #2 #1 #1#2#3
DMI3
CPU1 PCIe X16
CPU2 PCIe X8
NVME X8
RSC-G-A66
RSC-GN2-A68
Three riser options
PCIex4 or
SATA
M.2
Flexible I/O
6CH
6CH
CPU2
CPU1
CPU1 PCIe X16
CPU2 NVME X8
RSC-GN2-66
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