Motorola ColdFire MCF5281 - Manual (Page 405)

Freescale Semiconductor 22-1
Chapter 22
Queued Serial Peripheral Interface (QSPI)
22.1 Introduction
This chapter describes the queued serial peripheral interface (QSPI) module.
22.1.1 Block Diagram
Figure 22-1 illustrates the QSPI module.
Figure 22-1. QSPI Block Diagram
Queue Control
Block
Queue
Pointer
4
Done
Comparator
End Queue
Pointer
Status
Regs
Delay
Counter
Control Logic
Control
Regs
80-byte
QSPI
RAM
Chip
Selects
Command
Divide by 2
Baud Rate
Generator
msb lsb
Logic
Array
QSPI_CLK
QSPI_DIN 8/16 Bit Shift Reg.
Rx/Tx Data Reg.
QSPI_DOUT
4
4
Internal Bus
QSPI
Address
Register
QSPI
Data
Register
Internal Bus
Clock (f
sys
)
QSPI_CS[3:0]
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3