2 qspi delay register (qdlyr), 2 qspi delay register (qdlyr) -5 – Motorola ColdFire MCF5281 User Manual
Page 409
Queued Serial Peripheral Interface (QSPI)
Freescale Semiconductor
22-5
shows an example of a QSPI clocking and data transfer.
Figure 22-3. QSPI Clocking and Data Transfer Example
22.3.2
QSPI Delay Register (QDLYR)
The QDLYR is used to initiate master mode transfers and to set various delay parameters.
IPSBAR
Offset:
0x00_0344 (QDLYR)
Access: User read/write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
SPE
QCD
DTL
W
Reset
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
Figure 22-4. QSPI Delay Register (QDLYR)
Table 22-4. QDLYR Field Descriptions
Field
Description
15
SPE
QSPI enable. When set, the QSPI initiates transfers in master mode by executing commands in the command RAM.
The QSPI clears this bit automatically when a transfer completes. The user can also clear this bit to abort transfer
unless QIR[ABRTL] is set. The recommended method for aborting transfers is to set QWR[HALT].
14–8
QCD
QSPI_CLK delay. When the DSCK bit in the command RAM is set this field determines the length of the delay from
assertion of the chip selects to valid QSPI_CLK transition. See
Section 22.4.3, “Transfer Delays”
for information on
setting this bit field.
7–0
DTL
Delay after transfer. When the DT bit in the command RAM is set this field determines the length of delay after the
serial transfer.
QSPI_CLK
QSPI_DOUT
QSPI_DIN
QSPI_CS
A
B
QMR[CPOL] = 0
QMR[CPHA] = 1
QCR[CONT] = 0
Chip selects are active low
A = QDLYR[QCD]
B = QDLYR[DTL]
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
msb
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3