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參數(shù)資料
| 型號： | TC86R4600 |
| 廠商： | Toshiba Corporation |
| 英文描述： | 64 Bit RISC Microprocessor(64位精簡指令集微處理器) |
| 中文描述： | 64位RISC微處理器（64位精簡指令集微處理器） |
| 文件頁數(shù)： | 10/30頁 |
| 文件大小： | 267K |
| 代理商： | TC86R4600 |
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TC86R4600 64-bit RISC Microprocessor
8
T O S H IB A A M E R IC A E L E C T R O N IC C O M P O N E N T S , IN C
.
ExtRqst and Release are used to transfer control of the
SysAD and SysCmd buses between the processor and an external
device. When an external device needs to control the interface, it
asserts ExtRqst. The R4600 responds by asserting Release to
release the system interface to slave state.
ValidOut and ValidIn are used by the R4600 and the external
device respectively to indicate that there is a valid command or
data on the SysAD and SysCmd buses. The R4600 asserts Valid-
Out when it is driving these buses with a valid command or data,
and the external device drives ValidIn when it has control of the
buses and is driving a valid command/data identiTer or data.
Non-overlapping System Interface
The R4600 requires a non-overlapping system interface, compat-
ible with the R4000PC. This means that only one processor
request may be outstanding at a time and that the request must be
serviced by an external device before the R4600 issues another
request. The R4600 can issue read and write requests to an exter-
nal device, and an external device can issue read and write
requests to the R4600.
The R4600 asserts ValidOut and simultaneously drives the
address and read command on the SysAD and SysCmd buses. If
the system interface has RdRdy asserted, then the processor tri-
states its drivers and releases the system interface to slave state
by asserting Release. The external device can then begin sending
the data to the R4600.
Figure 6 on page 8 shows a processor block read request and
the external agent read response. The read latency is 4 cycles
(
ValidOut
to
ValidIn
), and the response data pattern is
DDxxDD. Figure 8 on page 9 shows a processor block write.
External Requests
The R4600 responds to requests issued by an external device.
The requests can take several forms. An external device may
need to supply data in response to an R4600 read request or it
may need to gain control over the system interface bus to access
other resources which may be on that bus. It also may issue
requests to the processor, such as a request for the R4600 to write
to the R4600 interrupt register.
The following is a list of the supported external requests:
￥ Read
￥ Write
￥ Null
Boot-Time Options
Fundamental operational modes for the processor are initialized
by the boot-time mode control interface. The boot-time mode
control interface is a serial interface operating at a very low fre-
quency (MasterClock divided by 256). The low frequency opera-
tion allows the initialization information to be kept in a low cost
EPROM; alternatively the twenty or so bits could be generated
by the system interface ASIC.
Immediately after the
VCCOk
signal is asserted, the proces-
sor reads a serial bit stream of 256 bits to initialize all fundamen-
tal operational modes. After initialization is complete, the
processor continues to drive the serial clock output, but no fur-
ther initialization bits are read.
J TAG Interface
For compatibility with the R4000PC, the R4600 supports the
JTAG interface pins, with the serial input connected to serial out-
put. Boundary scan is not supported.
Figure 8. Processor Block Read
TClock
RClock
SysAD
Addr
Data0
Data1
Data2
Data3
SysCmd
Read
CData
CData
CData
CEOD
ValidOut
ValidIn
RdRdy
WrRdy
Release
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