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Queued Serial Peripheral Interface (QSPI)
Freescale Semiconductor
30-13
The desired QSPI_CLK baud rate is related to the internal bus clock and QMR[BAUD] by the following
expression:
Eqn. 30-1
30.4.3
Transfer Delays
The QSPI supports programmable delays for the QSPI_CS signals before and after a transfer. The time
between QSPI_CS assertion and the leading QSPI_CLK edge, and the time between the end of one transfer
and the beginning of the next, are both independently programmable.
The chip select to clock delay enable bit in the command RAM, QCR[DSCK], enables the programmable
delay period from QSPI_CS assertion until the leading edge of QSPI_CLK. QDLYR[QCD] determines the
period of delay before the leading edge of QSPI_CLK. The following expression determines the actual
delay before the QSPI_CLK leading edge:
Eqn. 30-2
QDLYR[QCD] has a range of 1–127.
When QDLYR[QCD] or QCR[DSCK] equals zero, the standard delay of one-half the QSPI_CLK period
is used.
The command RAM delay after transmit enable bit, QCR[DT], enables the programmable delay period
from the negation of the QSPI_CS signals until the start of the next transfer. The delay after transfer can
be used to provide a peripheral deselect interval. A delay can also be inserted between consecutive
transfers to allow serial A/D converters to complete conversion. There are two transfer delay options: the
user can choose to delay a standard period after serial transfer is complete or can specify a delay period.
Writing a value to QDLYR[DTL] specifies a delay period. QCR[DT] determines whether the standard
delay period (DT = 0) or the specified delay period (DT = 1) is used. The following expression is used to
calculate the delay when DT equals 1:
Eqn. 30-3
Table 30-10. QSPI_CLK Frequency as Function of Internal Bus Clock and Baud Rate
Internal Bus Clock = 80 MHz
QMR [BAUD]
QSPI_CLK
2
20 MHz
4
10 MHz
8
5 MHz
16
2.5 MHz
32
1.25 MHz
255
156.9 kHz
QMR[BAUD]
f
sys 3
⁄
2
[desired QSPI_CLK baud rate]
×
-----------------------------------------------------------------------------------
=
QSPI_CS-to-QSPI_CLK delay
QDLYR[QCD]
f
sys/3
-------------------------------------
=
Delay after transfer
32
QDLYR[DTL]
×
f
sys/3
------------------------------------------------
(DT = 1)
=
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...