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16 www.xilinx.com 7 Series FPGAs Memory Resources
UG473 (v1.11) November 12, 2014
Chapter 1: Block RAM Resources
Read Operation
In latch mode, the read operation uses one clock edge. The read address is registered on the
read port, and the stored data is loaded into the output latches after the RAM access time.
When using the output register, the read operation takes one extra latency cycle.
Write Operation
A write operation is a single clock-edge operation. The write address is registered on the
write port, and the data input is stored in memory.
Write Modes
Three settings of the write mode determines the behavior of the data available on the
output latches after a write clock edge: WRITE_FIRST, READ_FIRST, and NO_CHANGE.
Write mode selection is set by configuration. The Write mode attribute can be individually
selected for each port. The default mode is WRITE_FIRST. WRITE_FIRST outputs the
newly written data onto the output bus. READ_FIRST outputs the previously stored data
while new data is being written. NO_CHANGE maintains the output previously
generated by a read operation.
Table 1-3: True Dual-Port Functions and Descriptions
Port Function Description
DI[A|B] Data input bus.
DIP[A|B]
(1)
Data input parity bus. Can be used for additional data inputs.
ADDR[A|B] Address bus.
WE[A|B] Byte-wide write enable.
EN[A|B] When inactive no data is written to the block RAM and the
output bus remains in its previous state.
RSTREG[A|B] Synchronous Set/Reset the output registers (DO_REG = 1). The
RSTREG_PRIORITY attribute determines the priority over
REGCE.
RSTRAM[A|B] Synchronous Set/Reset the output data latches.
CLK[A|B] Clock input.
DO[A|B] Data output bus.
DOP[A|B]
(1)
Data output parity bus. Can be used for additional data outputs.
REGCE[A|B] Output Register clock enable.
CASCADEIN[A|B] Cascade input for 64K x 1 mode.
CASCADEOUT[A|B] Cascade output for 64K x 1 mode.
Notes:
1. The Data-In Buses - DIADI, DIPADIP, DIBDI, and DIPBDIP section has more information on data
parity pins.
2. Block RAM primitive port names can be different from the port function names.
- 7 Series FPGAs 1
- Memory Resources 1
- Revision History 2
- RCCK_RST 3
- RCKC_RST 3
- RREC_RST 3
- RREM_RST 3
- Table of Contents 5
- About This Guide 9
- Additional Support Resources 10
- Block RAM Resources 11
- Block RAM Introduction 13
- UG473_c1_01_052610 15
- Read Operation 16
- Write Operation 16
- Write Modes 16
- NO_CHANGE Mode 17
- Conflict Avoidance 18
- Optional Output Registers 19
- Simple Dual-Port Block RAM 20
- Cascadable Block RAM 21
- Byte-Wide Write Enable 21
- RAMB36E1 TDP mode 36 4 22
- RAMB36E1 SDP mode 72 8 22
- RAMB18E1 TDP mode 18 2 22
- RAMB18E1 SDP mode 36 4 22
- Block RAM Library Primitives 23
- Block RAM Port Signals 26
- Set/Reset 27
- Cascade In 29
- Block RAM Address Mapping 30
- Block RAM Attributes 31
- Read Width - READ_WIDTH_[A 33
- Avoidance, page 18 34
- Considerations 35
- Block RAM Applications 37
- Block RAM 38
- Register 38
- Block RAM Timing Model 39
- RCCK_REGCE 40
- RCKC_REGCE 40
- RCKO_DO_REG 40
- Clock Event 1 41
- Clock Event 2 41
- Clock Event 4 41
- Stacked Silicon Interconnect 43
- Built-in FIFO Support 45
- Synchronous FIFO 46
- FIFO Primitives 48
- UG473_c2_04_052610 49
- Standard Mode 51
- UG473_c2_05_052610 51
- Empty Flag 52
- Almost Empty Flag 52
- Read Error Flag 52
- Full Flag 53
- Write Error Flag 53
- Almost Full Flag 53
- FIFO Timing Characteristics 58
- EMPTY Signal 59
- RCCK_WREN 60
- RCKO_AFULL 60
- RCKO_FULL 60
- RCKO_WRERR 61
- RCCK_RDEN 61
- FIFO Applications 64
- UG473_c2_11_052610 65
- 512 x 144 FIFO 66
- UG473_c2_12_052610 66
- UG473_c2_13_052610 67
- Built-in Error Correction 69
- ECC Modes 70
- UG473_c3_01_052610 71
- RAMB36E1 72
- UG473_c3_03_052610 73
- FIFO36E1 73
- ECC Modes of Operation 76
- UG473_c3_06_100610 78
- UG473_c3_07_070110 78
- Standard ECC 79
- Standard ECC Write 80
- Standard ECC Read 80
- Set by Attributes 80
- ECC Encode-Only Write 80
- ECC Encode-Only Read 81
- DO_REG = 0 82
- DO_REG = 1 82
- Encode-Only ECC Write Timing 83
- Encode-Only ECC Read Timing 83
- Decode-Only ECC Write Timing 83
- Decode-Only ECC Read Timing 83
- RCKO_PARITY_ECC 85
- RCKO_SBIT_ECC 85
- RCKO_SBIT_ECC_REG 85
- RCKO_DBIT_ECC 85
- RCKO_DBIT_ECC_REG 85
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