参数资料
型号: IDT79RC64T575250DPI
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 微控制器/微处理器
英文描述: 64-BIT, 250 MHz, RISC PROCESSOR, PQFP208
封装: 28 X 28 MM, 3.40 MM HEIGHT, PLASTIC, QFP-208
文件页数: 5/28页
文件大小: 571K
代理商: IDT79RC64T575250DPI
13 of 28
December 14, 2001
79RC64574 79RC64575
RC64574 Socket Compatibility to RC64474 & RC4640
The RC64574/575 is 100% pin compatible with the RC64474/475 with the supply voltage being the only difference. RC64474/475 requires a 3.3V
supply, while RC64574/575 requires a 2.5V supply.
To ensure socket compatibility between the RC64574/RC64474 and the RC4640 devices, several pin changes are required, as shown in the tables
below. Note: The RC64574/575 are 2.5V parts and as such all Vcc must be at the correct voltage for a given part.
RC64575 Socket Compatibility to RC64475 & RC4650
Pin
RC4640
RC64574/
RC64474
Compatible to
RV4640?
Comments
1
N.C
JTAG32*
Yes
Pin has an internal pull-down, to enable 32-bit scan.
Can also be left a N.C.
48
Vss
TDO
Yes
Can be driven with Vss, if JTAG is not needed. Is tristated when
TRst* is low.
49
Vss
TMS
Yes
Can be driven with Vss if JTAG is not needed.
50
Vss
TCK
Yes
Can be driven with Vss if JTAG is not needed.
51
Vss
TRst*
Yes
Can be driven with Vss if JTAG is not needed.
52
Vss
TDI
Yes
Can be driven with Vss if JTAG is not needed.
71
N.C.
JR_Vcc
Yes
Can be left N.C. in RC64574, if JTAG is not need. If JTAG is
needed, it must be driven to Vcc.
Table 8 RC64574 Socket Compatibility to RC64474 and R4640
Pin
RV4650
32-bit
RC64575
32-bit
RC64475
32-bit
RV4650
64-bit
RC64575
64-bit
RC64475
64-bit
Compatible to
RV4650?
Comments
53
N.C.
JTAG32*
No Connect
JTAG32*
Yes
In 32-bit, this pin can be left uncon-
nected because of internal pull-down.
In 64-bit, this assumes that JTAG will
not be used. If using JTAG, this pin
must be at Vcc.
150
N.C.
JR_Vcc
No Connect
JR_Vcc
Yes
In RC64475, can be left a N.C, if
JTAG is not need. If JTAG is needed,
it must be driven to Vcc.
180
N.C.
TDI
No Connect
TDO
Yes
If JTAG is not needed, can be left a
N.C.
181
N.C.
TRsT*
No Connect
TRsT*
Yes
If JTAG is not needed, can be left a
N.C.
182
N.C.
TCK
No Connect
TCK
Yes
If JTAG is not needed, can be left a
N.C.
183
N.C.
TMS
No Connect
TMS
Yes
If JTAG is not needed, can be left a
N.C.
184
N.C.
TDO
No Connect
TDIO
Yes
If JTAG is not needed, can be left a
N.C.
Table 9 RC64575 Socket Compatibility to RC64475 & RC4650
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