Open Access
Expanding and Monitoring the APB
5-5
ARM Development Board (ARM7TDMI Version)
Hardware Reference Guide
ARM DUI 0017C
5.2 Building an APB Slave Expansion Board
To build an APB peripheral or slave that connects to the motherboard, you need the following
signals:
P_D a number of data bits
P_A a number of address bits
P_STB strobe signal
P_WRITE read/write signal
P_SELEX select signal reserved for expansion devices
5.2.1 System clock and reset
If the application requires a system clock and reset:
B_RES[2:0] only B_RES[2] is usually required
B_CLK or nB_CLK if other clock edge is required
5.2.2 Interrupts
If the slave generates interrupts:
nINTAPB[2:0] one or more of these IRQ sources
nFIQSRC possibly the FIQ source
hrg.book Page 5 Wednesday, July 22, 1998 9:18 AM
To Next Page
Loading...
