P2G Configuration Register (P2Gcfg) 0Xd090 - Toshiba TMPR4937 Manual

10.4.19 P2G Configuration Register (P2GCFG)
31
Reserved
15 14 13 12
FTRD FTA
Reserved MEM0PD MEM1PD MEM2PD
R/W R/W R/W
0x0 0x0 0x0
Bit Mnemonic Field Name
31:23
Reserved
22 PME PME
21:20 TPRBL Target Prefetch
Read Burst
Length
19:16 Reserved
15 FTRD Force Target
Retry/Disconnect
14 FTA Force Target
Abort
13 Reserved
Memory 0
12 MEM0PD
Window Prefetch
Disable
11 10 9 8
TOBFR TIBFR
R/W R/W R/W R/W
0x0 0x1 0x0 0x0
PME (Default: 0x0)
When the PCI Controller is in the Satellite mode, writing "1" to this bit
signals a PME (Power Management Event) to the PCI Host device. The
PME* signal is asserted if the PME_Status bit of the PMCSR Register is
set and the PME_En bit of the PMCSR Register is set.
This bit is cleared when the PCI Host device writes a "1" to the PME_Status
bit of the PMCSR Register.
This bit is invalid when the PCI Contoller is in the Host mode since the
PME* signal is an input signal.
Target Prefetch Read Burst Length (Default: 0x3)
These bits set the number of DWORDS (32-bit words) to be read into the
data FIFO when prefetching is valid during a target memory Read
operation.
Extra data transferred to the data FIFO is deleted when performing a
memory Read operation of a PCI Bus transfer that is smaller than the set
size.
This setting is invalid when prefetching is disabled.
0x00: Access and transfer each 2 DWORDs of data to the target read FIFO.
0x01: Access and transfer each 4 DWORDs of data to the target read FIFO.
0x10: Access and transfer each 6 DWORDs of data to the target read FIFO.
0x11: Access and transfer each 8 DWORDs of data to the target read FIFO.
Force Target Retry/Disconnect (Default: 0x0)
The PCI Controller executes Retry Termination on a PCI Read access
transaction if this bit is set to "1". This is a diagnostic function.
Force Target Abort (Default: 0x0)
The PCI Controller executes a Target Abort on a PCI Read access
transaction if this bit is set to "1". This is a diagnostic function.
Memory 0 Window Prefetch Disable (Default: 0x0)
Prefetching during a G-Bus Burst Read transfer cycle to the Memory 0
Space is disabled when this bit is set to "1". PCI Burst Read transactions
are not supported when prefetching is disabled.
Even if the setting of this bit is changed, prefetchable bits in the Base
Address Register of the PCI Configuration Space will not reflect this
change. We recommend using the default setting when the PCI Controller
is in the Satellite mode.
Figure 10.4.17 P2G Configuration Register (1/2)
10-44
Chapter 10 PCI Controller
0xD090
23 22 21 20
PME TPRBL
R/W1S R/W
0x0 0x3
7
Reserved
Description
19 16
Reserved
: Type
: Initial value
0
: Type
: Initial value
Read/Write
⎯
R/W1S
R/W
⎯
R/W
R/W
⎯
R/W