
Crossbar Switch (XBS)
12-4
Freescale Semiconductor
12.4.1
XBS Priority Registers (XBS_PRS
n
)
The priority registers (XBS_PRS
n
) set the priority of each master port on a per slave port basis and reside
in each slave port. The priority register can be accessed only with 32-bit accesses. After the
XBS_CRS
n
[RO] bit is set, the XBS_PRS
n
register can only be read; attempts to write to it have no effect
on XBS_PRS
n
and result in a bus-error response to the master initiating the write.
Additionally, no two available master ports may be programmed with the same priority level, including
reserved masters. Attempts to program two or more masters with the same priority level result in a
bus-error response (see
Section 11.2.7, “SCM Interrupt Status Register (SCMISR)”
) and the XBS_PRS
n
is not updated.
0xFC00_4600
Priority Register Slave 6 (XBS_PRS6)
32
R/W
0x6543_0210
0xFC00_4610
Control Register Slave 6 (XBS_CRS6)
32
R/W
0x0000_0000
0xFC00_4700
Priority Register Slave 7 (XBS_PRS7)
32
R/W
0x6543_0210
0xFC00_4710
Control Register Slave 7 (XBS_CRS7)
32
R/W
0x0000_0000
Address: 0xFC00_4100 (XBS_PRS1)
0xFC00_4400 (XBS_PRS4)
0xFC00_4600 (XBS_PRS6)
0xFC00_4700 (XBS_PRS7)
Access: Supervisor read/write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R 0
M7
0
M6
0
M5
0
M4
0 0 0 0 0
M2
0
M1
0
M0
W
Reset 0 1 1 0 0 1 0 1 0 1 0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0
Figure 12-2. XBS Priority Registers Slave n (XBS_PRSn)
Table 12-3. XBS_PRSn Field Descriptions
Field
Description
31
Reserved, must be cleared.
30–28
M7
Master 7 (Factory Test) priority. Sets the arbitration priority for this port on the associated slave port.
000 This master has level 1 (highest) priority when accessing the slave port.
001 This master has level 2 priority when accessing the slave port.
010 This master has level 3 priority when accessing the slave port.
011 This master has level 4 priority when accessing the slave port.
100 This master has level 5 priority when accessing the slave port.
101 This master has level 6 priority when accessing the slave port.
110 This master has level 7 (lowest) priority when accessing the slave port.
Else Reserved
27
Reserved, must be cleared.
26–24
M6
Master 6 (USB OTG) priority. See M7 description.
Table 12-2. XBS Memory Map (continued)
Address
Register
Width
(bits)
Access
Reset Value
Section/Page
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...