Toshiba TX49 TMPR4937, Manual

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Chapter 5 Configuration Registers
5-4
Bit Mnemonic Field Name Description Initial Value Read/Write
23 PCI66 PCI 66MHz
Mode Used to inform the device connected to the PCI bus that a 66
MHz operation is to be performed. This bit is valid only when the
PCI controller of the TX4937 is in host mode. (Refer to Section
10.3.8.)
0 = Do not perform a 66 MHz operation.
1 = Perform a 66 MHz operation. 0 R/W
22 PCIMODE PCI
Operation
Mode Indicates information about the operation mode of the TX4937
PCI controller. (Refer to Section 10.3.1.)
L: 0: Satellite mode
H: 1: Host mode ADDR[19] R
21 ⎯ Reserved ⎯ ⎯ ⎯
20:17 DIVMODE CPUCLK
Frequency
Multiplication
Factor
Indicates information about the frequency multiplication factor of
the TX49/H3 core clock (CPUCLK) to the MASTERCLK. This
field is set with a result of encoding an initial input value at
ADDR[3:0].
The PLL incorporated in the TX4937 multiplies the
MASTERCLK and supplies the resulting frequency to the
TX49/H3 core.
The value set in DIVMODE[3:0] is reflected in the EC field of the
TX49/H3 core Config register.
ADDR[3:0]:DIVMODE[3:0]
HHHH: 0100: CPUCLK freq.
=
2
×
MASTERCLK freq.
HHHL: 1111: CPUCLK freq.
=
2.5
×
MASTERCLK freq.
HHLH: 0101: CPUCLK freq.
=
3
×
MASTERCLK freq.
HHLL: 0110: CPUCLK freq.
=
4
×
MASTERCLK freq.
LHHH: 1101: CPUCLK freq. = 4.5 x MASTERCLK freq.
LHHL: ---- : Reserved
LHLH: ---- : Reserved
LHLL: ---- : Reserved
HLHH: 0000: CPUCLK freq.
=
8
×
MASTERCLK freq.
HLHL: 1011: CPUCLK freq.
=
10
×
MASTERCLK freq.
HLLH: 0001: CPUCLK freq.
=
12
×
MASTERCLK freq.
HLLL: 0010: CPUCLK freq.
=
16
×
MASTERCLK freq.
LLHH: 1001: CPUCLK freq.
=
18
×
MASTERCLK freq.
LLHL: ---- : Reserved
LLLH: ---- : Reserved
LLLL: ---- : Reserved
ADDR[3:0] R
16 BEOW Write-Access
Bus Error Indicates that a timeout error has occurred in the internal bus (G-
Bus) during a write bus transaction of the TX49/H3 core. This bit
corresponds to interrupt No. 1 in the interrupt controller.
0 = No error has occurred.
1 = An error has occurred. 0 R/W1C
15 WR Watchdog
Timer Mode Specifies how information will be reported in watchdog timer
mode (refer to Section 12.3.6).
0 = Generate an NMI exception.
1 = Generate a watchdog reset. 0 R/W
14 TOE G-Bus
Timeout
Error
Detection Specifies whether to detect and report a bus timeout error in the
internal bus (G-Bus) of the TX4937.
0 = Do not detect or report a bus timeout error.
1 = Detect and report a bus timeout error. 0 R/W
13 PCIARB
PCI Arbiter
Selection Indicates the PCI bus arbiter selection setting (refer to Section
10.3.12).
L: 0 = External PCI bus arbiter
H: 1 = Built-in PCI bus arbiter
DATA[2] R
Figure 5.2.1 Chip Configuration Register (2/3)