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IDT79RV4640-100DUI Datasheet(PDF) 7 Page - Integrated Device Technology

Part # IDT79RV4640-100DUI
Description  Low-Cost Embedded 64-bit RISController w/ DSP Capability
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT79RV4640-100DUI Datasheet(HTML) 7 Page - Integrated Device Technology

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April 10, 2001
IDT79RC4640™
Boot-Time Options
Boot-Time Options
Boot-Time Options
Boot-Time Options
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
RC4640 responds by asserting Release* to release the system interface
to slave state.
ValidOut* and ValidIn* are used by the RC4640 and the external
device respectively to indicate that there is a valid command or data on
the SysAD and SysCmd buses. The RC4640 asserts ValidOut* 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 or data.
Non-overlapping System Interface
Non-overlapping System Interface
Non-overlapping System Interface
Non-overlapping System Interface
The RC4640 requires a non-overlapping system interface, compat-
ible with the RC4700. 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 RC4640 issues another request. The RC4640
can issue read and write requests to an external device, and an external
device can issue read and write requests to the RC4640.
The RC4640 asserts ValidOut* and simultaneously drives the
address and read command on the SysAD and SysCmd buses. If the
system interface has RdRdy* or Read transactions asserted, then the
processor tristates its drivers and releases the system interface to slave
state by asserting Release*. The external device can then begin sending
the data to the RC4640.
Fundamental operational modes for the processor are initialized by
the boot-time mode control interface. The boot-time mode control inter-
face is a serial interface operating at a very low frequency (MasterClock
divided by 256). The low-frequency operation 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 or a simple
PAL.
Immediately after the VCCOK Signal is asserted, the processor
reads a serial bit stream of 256 bits to initialize all fundamental opera-
tional modes. After initialization is complete, the processor continues to
drive the serial clock output, but no further initialization bits are read.
Boot-Time Modes
Boot-Time Modes
Boot-Time Modes
Boot-Time Modes
The boot-time serial mode stream is defined in Table 6. Bit 0 is the bit
presented to the processor when VCCOK is asserted; bit 255 is the last.
Power Management
Power Management
Power Management
Power Management
CP0 is also used to control the power management for the RC4640.
This is the standby mode and it can be used to reduce the power
consumption of the internal core of the CPU. The standby mode is
entered by executing the WAIT instruction with the SysAD bus idle and
is exited by any interrupt.
Standby Mode Operation
Standby Mode Operation
Standby Mode Operation
Standby Mode Operation
The RC4640 provides a means to reduce the amount of power
consumed by the internal core when the CPU would otherwise not be
performing any useful operations. This is known as “Standby Mode”.
Entering Standby Mode
Entering Standby Mode
Entering Standby Mode
Entering Standby Mode
Executing the WAIT instruction enables interrupts and enters
Standby mode. When the WAIT instruction finishes the W pipe-stage, if
the SysAd bus is currently idle, the internal clocks will shut down, thus
freezing the pipeline. The PLL, internal timer, and some of the input pins
(Int[5:0]*, NMI*, ExtReq*, Reset*, and ColdReset*) will continue to run.
Figure 2 Typical RC4640 System Architecture
RV4640
Memory I/O
Controller
Control
Address
SCSI
ENET
32
9
Boot
ROM
DRAM
(80ns)
2
11


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