Motorola MPC8260 - Manual (Page 528)

18-4 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
18.2.2 SDMA Mask Register (SDMR)
The SDMA mask register (SDMR) is an 8-bit read/write register with the same bit format
as the SDMA status register. If an SDMR bit is 1, the corresponding interrupt in SDSR is
enabled. If the bit is zero, the corresponding interrupt in the status register is masked.
SDMR is cleared at reset. SDMR can be accessed at 0x1101C.
18.2.3 SDMA Transfer Error Address Registers (PDTEA and LDTEA)
There are two 32-bit, read-only SDMA address registers. The PDTEA holds the system
address accessed during an SDMA transfer error on the 60x bus. The LDTEA holds the
system address accessed during an SDMA transfer error on the local bus. Both registers are
undeÞned at reset. PDTEA can be accessed at 0x10050; LDTEA can be accessed at
0x10058.
18.2.4 SDMA Transfer Error MSNUM Registers (PDTEM and LDTEM)
There are two SDMA transfer error MSNUM registers (PDTEM and LDTEM).
MSNUM[0Ð4] contains the sub-block code (SBC) used to identify the current peripheral
controller accessing the bus. MSNUM[5] identiÞes which half of the controller is
transferring (transmitter or receiver). The MSNUM of each transaction is held in these
registers until the transaction is complete.
PDTEM is for SDMA transfer errors on the 60x bus, and LDTEM is for errors on the local
bus. Both registers are undeÞned at reset. See Figure 18-4.
Table 18-2 describes PDTEM and LDTEM Þelds.
Bits 0 1 2 3 4 5 6 7
Field MSNUM Ñ
Reset Ñ
R/W R
Addr 0x10054 (PDTEM); 0x1005C (LDTEM)
Figure 18-4. SDMA Transfer Error MSNUM Registers (PDTEM/LDTEM)
Table 18-2. PDTEM and LDTEM Field Descriptions
Bits Name Description
0Ð4 MSNUM
[0Ð4]
Bits 0Ð4 of MSNUM is the sub-block code of the current peripheral controller accessing the bus. See
the SBC Þeld description of the CPCR in Section 13.4.1, ÒCP Command Register (CPCR).Ó
5 MSNUM
[5]
Bit 5 of MSNUM indicates which section of the peripheral controller is accessing the bus.
0 Transmit section
1 Receive section
6Р7 С Reserved, should be cleared.