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34 www.xilinx.com 7 Series FPGAs Memory Resources
UG473 (v1.11) November 12, 2014
Chapter 1: Block RAM Resources
Mode Selection - RAM_MODE
This attribute selects either true dual-port mode (TDP) or simple dual-port mode (SDP).
The valid values are: TDP (default) or SDP.
Write Mode - WRITE_MODE_[A|B]
This attribute determines the write mode of the A/B input ports. The possible values are
WRITE_FIRST (default), READ_FIRST, and NO_CHANGE. Additional information on the
write modes is in the Write Modes section.
RDADDR_COLLISION_HWCONFIG
This attribute allows a trade off between performance and potential address overlap
(collision) in SDP or TDP mode. Address overlap can occur in synchronous or
asynchronous clocking applications if a block RAM in SDP mode is set to READ_FIRST or
a block RAM in TDP mode has set any port to READ_FIRST mode. For the RAMB36E1,
address overlap is defined as A14-A8 being identical for both ports in the same clock cycle
and both ports are enabled. For the RAMB18E1, address overlap is defined as A13-A7
being identical for both ports in the same clock cycle and both ports are enabled.
If an address overlap (collision) cannot occur, the full block RAM performance can be
reclaimed by setting this attribute to PERFORMANCE. Otherwise, you should set it to
DELAYED_WRITE (default). If an address collision occurs in PERFORMANCE mode, the
content of the memory cells can be corrupted.
Note:
The address overlap condition is separate from the address collision described in Conflict
Avoidance, page 18.
SIM_COLLISION_CHECK
This attribute sets the level of collision checking and behavior in the simulation model.
Possible values are ALL (default), GENERATE_X_ONLY, NONE, and WARNING_ONLY.
INIT_FILE
This attribute points to an optional RAM initialization file (initial content). The values are
NONE (default) or a STRING (the file name). For the file format, refer to the ISE® software
documentation.
SIM_DEVICE
This attribute sets the simulation target device family. Allowed values are NONE (default)
or a STRING with the family name: VIRTEX5, VIRTEX6 (default), 7_SERIES.
Block RAM Location Constraints
Block RAM instances can have LOC properties attached to them to constrain placement.
Block RAM placement locations differ from the convention used for naming CLB locations,
allowing LOC properties to transfer from array to array.
The LOC properties use this form:
LOC = RAMB36_X#Y#
- 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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