ARM ARM DUI 0224I HCLKCTRL70, HCLKM1M2F, HCLKM2M2F, HCLKSMF2F, HCLKM1F2F, HCLKM2F2F, HCLKSF2F

Hardware Description

Table 3-6 Asynchronous clock signals

Clock signal	Frequency	Description	Source
HCLKCTRL[7:0]	-	These signals control the multiplexor that selects clocks for the	FPGA
		ARM926EJ-S PXP Development Chip.
HCLKM1M2F	-	These are FPGA input clocks (for M1, M2, and S) that can be	Clock
HCLKM2M2F		routed to HCLKxM2F and used as clocks for the M1, M2, and S	select
HCLKSMF2F		buses in the FPGA.	logic
HCLKM1F2F	-	These are FPGA output clocks (for M1, M2, and S) that can be used	Clock
HCLKM2F2F		as feedback signals to DLLs in the FPGA.	select
HCLKSF2F			logic
HCLKM1F2S	-	These are FPGA output clocks (for M1, M2, and S) that can be used	FPGA
HCLKM2F2S		as ARM926EJ-S PXP Development Chip reference clocks.
HCLKSF2S
HCLKM1F2L	-	These are FPGA output clocks (for M1, M2, and S) that can be used	FPGA
HCLKM2F2L		as RealView Logic Tile reference clocks. By default, these are
HCLKSF2L		driven by OSC0.
HCLKM1L2S	-	These are RealView Logic Tile output clocks (for M1, M2, and S)	RealView
HCLKM2L2S		that can be used as ARM926EJ-S PXP Development Chip	Logic Tile
HCLKSL2S		reference clocks.
HCLKM1L2F	-	These are RealView Logic Tile output clocks (for M1, M2, and S)	RealView
HCLKM2L2F		that can be used as clocks for buses in the FPGA.	Logic Tile
HCLKSL2F
ICS307 control	-	The signals ICS307_CLK, ICS307_DATA, and
signals		ICS307_STRB[4:0] clock data from the SYS_OSCx registers in
		the FPGA to the programmable oscillators.
OSC0		For the image provided with the FPGA and the default
		HCLKCTRL[7:0] value of 0xE0, programmable oscillator OSC0
		is the source for the XTALCLKEXT, GLOBAL_CLK,
		HCLKM1, HCLKM2, HCLKS, and PLLCLKEXT signals.
OSC1		Programmable oscillator OSC1 is the source for PLLCLKEXT
		and can be selected as the source for the HCLKM1 signal.
OSC2		Programmable oscillator OSC2 can be used the source for the
		HCLKM2 signal.
OSC3		Programmable oscillator OSC3 can be used the source for the
		HCLKS signal.

3-46 Copyright © 2003-2010 ARM Limited. All rights reserved. ARM DUI 0224I