Intel Pentium 4 User Manual

System Bus Routing
R
76 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
5.4.1.6 Topology 4: BR0# and RESET#
Since the processor does not have on-die termination on the BR0# and RESET# signals, it is
necessary to terminate using discrete components on the system board. Connect the signals
between the components as shown in Figure 41. The Intel 850 chipset has on-die termination and
thus it is necessary to terminate only at the processor end. The value of Rt should be 51 Ω ±5% for
RESET#. The value of Rt should be 150–220 Ω ±5% for BR0#.
Figure 41. Routing Illustration for BR0# and RESET#
MCH Processor
L2
R
t
VCC_CPU
L1
BR0-RESET_Routing
Table 19: BR0# and RESET# Lengths
Signal Rt L1 L2
RESET# 51 Ω ≤ 1–2” 6–10”
BR0# 150–220 Ω ≤ 1–2” 6–10”
5.4.1.7 Topology 5: COMP[1:0] Signals
Terminate the COMP[1:0] pins to ground through a 51 Ω ±1% resistor as close as possible to the
pin. Do not wire COMP pins together, connect each pin to its own termination resistor.
5.4.1.8 Topology 6a: BSEL[1:0] Termination – 400 MHz System Bus Only
The BSEL[1:0] signals on the processor should be left as no-connect. The CK00 part should be
configured for 100 MHz BCLK[1:0]operation.
5.4.1.9 Topology 6b: BSEL[1:0] Termination – 533/400 MHz System Bus
The BSEL0 signal on the processor should be routed to the CK00 Sel100/133 pin. BSEL1 can be
left as a no-connect. See Figure 17.

Intel Pentium 4 Specifications

General

Architecture	x86
Core Count	1
Microarchitecture	NetBurst
Manufacturer	Intel
Core Names	Willamette, Northwood, Prescott, Cedar Mill
Virtualization Technology	No
Release Date	November 20, 2000
Clock Speed	1.3 GHz to 3.8 GHz
FSB Speed	400 MHz to 1066 MHz
Socket	Socket 423, Socket 478, LGA 775
Introduced	2000
Product Line	Pentium
Front Side Bus	400 MHz to 1066 MHz
Hyper-Threading	Yes (Prescott and later)
64-bit Support	Yes (Prescott and later)
Instruction Set	MMX, SSE, SSE2, SSE3
Discontinued	2008
Process Technology	180 nm, 130 nm, 90 nm, 65 nm
L2 Cache	256 KB, 512 KB, 1 MB, 2 MB
Lithography	180 nm, 130 nm, 90 nm, 65 nm
L1 Cache	8 KB