xcr3320 Xilinx Corp., xcr3320 Datasheet - Page 15

• Manufacturer Part Number: xcr3320
• Description: Xcr3320 320 Macrocell Sram Cpld
• Manufacturer: Xilinx Corp.

This product has been discontinued. Please see
XCR3320: 320 Macrocell SRAM CPLD
Compression Bits:
This 2-bit field defines the use of compression of the data
packets.
Data Frames
The four types of data frames are standard, compressed,
user_code, and isc_code. All fields must be completely
filled, with 1s used to fill unused bits. The definition of each
frame is described below:
Standard Frame
Address:
Data:
Stop bit:
Align bit:
15
igure 13: Standard Frame
MSB
00 - Standard mode:
The data packet contains both address and data
01 - Reset mode:
The data packet contains only the address field.
This pattern causes the configuration register to be
reset.
10 - Hold mode:
The data packet contains only the address field.
This pattern causes the configuration register to
hold its value.
11 - Set mode:
The data packet contains only the address field.
This pattern causes the configuration register to be
set.
This is an 11 bit field for providing 338 (336 SRAM
plus 2user) addresses.
546 bit field.
This is a one bit field which must be 0.
This is a two bit field which must be 11.
ADDRESS
11
DATA FRAME
546
STOP BIT
1 (0)
www.xilinx.com/partinfo/notify/pdn0007.htm
ALIGN BITS
SP00595
2 (11)
www.xilinx.com
1-800-255-7778
LSB
Compressed Frame
The compressed frame contains no data.
User Code Frame
Figure 15: User Code Frame
The user code is located at address 336.
Length Count:
Device ID:
User Code:
ISC Code Frame
The isc_code address is 337.
Figure 16: ISC Frame
The ISC frame allows the user to write an ISC code to the
device.
igure 14: Compressed Frame
MSB
ADDRESS
MSB
MSB
This is a 24 bit field containing the length of the
data stream transmitted to configure all of the
devices in the daisy chain. This field is only used by
a XCR3320 if it is in the master mode.
This is a 32-bit field containing XCR3320 device ID:
0000_001_001_010000_1_000_00000010101_1
This is a 216 bit field reserved for user information.
ADDRESS
11
11
ADDRESS
UNUSED
11
UNUSED
2
274
ISC CODE
272
LENGTH
COUNT
24
for details.
UNUSED
STOP BIT
DS033 (v1.3) October 9, 2000
DEVICE
272
1 (0)
32
ID
CODE
USER
STOP BIT
216
1 (0)
ALIGN BITS
STOP
1 (0)
BIT
ALIGN BITS
2 (11)
2 (11)
SP00599
SP00597
SP00598
ALIGN
2 (11)
BITS
LSB
LSB
LSB
R