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UG473 (v1.11) November 12, 2014
Block RAM Port Signals
Data-In Buses - DIADI, DIPADIP, DIBDI, and DIPBDIP
Data-in buses provide the new data value to be written into RAM. The regular data-in bus
(DI), plus the parity data-in bus (DIP) when available, have a total width equal to the port
width. For example the 36-bit port data width is represented by DI[31:0] and DIP[3:0], as
shown in Table 1-9 through Table 1-12. See Table 1-13 for SDP mode port name mapping.
Data-Out Buses - DOADO, DOPADOP, DOBDO, and DOPBDOP
Data-out buses reflect the contents of memory cells referenced by the address bus at the
last active clock edge during a read operation. During a write operation (WRITE_FIRST or
READ_FIRST configuration), the data-out buses reflect either the data being written or the
stored value before write. During a write operation in NO_CHANGE mode, data-out
buses are not changed. The regular data-out bus (DO) plus the parity data-out bus (DOP)
(when available) have a total width equal to the port width, as shown in Table 1-9 through
Table 1-12. See Table 1-13 for SDP mode port name mapping.
Cascade In
CASCADEINA, CASCADEINB, CASCADEOUTA, and CASCADEOUTB
The CASCADEIN/CASCADEOUT pins are used to connect two block RAMs to form the
64K x 1 mode (Figure 1-10). The CASCADEIN pins of the upper block RAM are connected
to the CASCADEOUT pins of the lower block RAM of the corresponding ports. When
cascade mode is not used, this pin does not need to be connected. Refer to the Cascadable
Block RAM for further information. Cascading is only available in TDP mode.
DOP[1:0] = DOPADOP[1:0] DOP[1:0] = DOPADOP[1:0] DOP[3:0] = DOPADOP[3:0] DOP[3:0] = DOPADOP[3:0]
DO[31:16] = DOBDO[15:0] DO[63:32] = DOBDO[31:0]
DOP[3:2] = DOPBDOP[1:0] DOP[7:4] = DOPBDOP[3:0]
Table 1-13: SDP Mode Port Name Mapping (Cont’d)
RAMB18E1 in SDP Mode RAMB36E1 in SDP Mode
X36 Mode (Width = 36) X18 Mode (Width ≤ 18) X72 Mode (Width = 72) X36 Mode (Width ≤ 36)
X-Ref Target - Figure 1-10
Figure 1-10: Two RAMB36E1s Cascaded
UG473_c1_10_040411
Upper
RAMB36E1
Lower
RAMB36E1
CASCADEINA CASCADEINB
CASCADEOUTA CASCADEOUTB
11
- 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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