ORSPI4 datasheet(37/263 Pages) LATTICE

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Lattice Semiconductor

ORCA ORSPI4 Data Sheet

SPIA_TX64_ERR_1

FPGA

→ Core

Packet error indication. A '1' indicates an error has occurred for the current

packet being transmitted. The ERR signal must be asserted coincident with

the EOP signal.

When an EOP is detected by the DPRAM Write Pointer Logic, the address

pointer will be automatically incremented to the next location within the

FIFO partition range.

SPIA_TX64_WE_1

FPGA

→ Core

Write Enable. A logic '1' causes data on the SPIA_TX64_DATA_1[63:0] bus

to be captured for a write to the DPRAM.

SPIA_TX64_PORT_1[7:0]

FPGA

→ Core

SPI4 port indicator, used to associate the current transmit data with a par-

ticular port number.

SPIA_TX64_WD_CNT_RST_

FPGA

→ Core

Line Write Termination indicator. This signal causes the FIFO write address

pointer within the embedded core to increment to the next address location

for the addressed partition. This signal can be used for custom applications

as well as for diagnostic test functions.

SPIA_TX64_LINK_DIS_1

FPGA

→ Core

Link disable control signal. When asserted to a logic '1', the AMA will cease

polling from a DPRAM. All ports associated with a disabled DPRAM will

remain unserviced until the control signal is deasserted. The AMA will send

IDLE data across the SPI4 link. If the application continues to write data to

that port FIFO, it will eventually ﬁll and provide proper FIFO ﬁll status to the

application.

SPIA_TX64_CLK_1

FPGA

→ Core

Transmit write clock reference. The clocks across the different transmit

interfaces are independent from each other, and are not required to be syn-

chronous to each other.

SPIA_TX64_FIFO_FULL_1

Core

→FPGA

FIFO full status. The status is given in response to the assertion of any

valid address on the SPIA_TX64_ADDR_1[2:0] bus. This signal will be

asserted to a logic '1' when the current FIFO partition has crossed the con-

ﬁgured ﬁll level within the partition.

Status

/Os

SPIA_TX64_PORT_ID[7:0]

Core

→FPGA

Port number of the currently serviced SPI4 data port. The value can either

be the actual SPI4 value or a programmed user value. Further details are

provided in the TX Calendar Control Logic description.

SPIA_TX64_STAT[1:0]

Core

→FPGA

Status of the SPI4 port currently being serviced. These signals can be

used in conjunction with the FIFO partition FIFO to police transmit trafﬁc

congestion for a particular SPI4 port.

SPIA_TX64_BURST_VAL[3:0]

Core

→FPGA

Indicates the number of SPI4 cycles the currently active port will be ser-

viced. Each cycle indicates an attempt to read 128 bits of data from the

respective FIFO partition.

SPIA_TREFCLK_X8

FPGA

→ Core

Transmit reference clock. This clock signal is 1/4th the SPI4 clock. This sig-

nal can be used to synchronize FPGA application logic to the FPSC logic.

Misc.

I/Os

SPI_SATM_A

FPGA

→ Core ‘0’ - Incoming ATSCLK is assumed to be edge-aligned with the data and

centered to the data eye within the chip.

‘1’ - Incoming ATSCLK is assumed to be skewed with respect to the data

off-chip.

Table 4. SPIA Core Transmit FPGA Interface in 128-Bit Mode

DPRAM

FPGA Interface I/Os

Direction

From/To

Description

SPIA_TX128_ADDR[2:0]

FPGA

→ Core

Virtual FIFO Write Address. Each DPRAM can be divided up to a maximum

of eight partitions. When operating in 128-bit mode, each partition will be 4x

the depth of the corresponding partition in 32-bit mode. More than one port

can be conﬁgured to share a virtual FIFO partition.

SPIA_TX128_DATA[127:0]

FPGA

→ Core User Write data. A single write will complete an entire 128-bit line.

Note: For SPIB replace A with B

Table 3. SPIA Core Transmit FPGA Interface in 64-Bit Mode (Continued)

DPRAM

FPGA Interface I/Os

Direction

From/To

Description

Note: For SPIB replace A with B

ORSPI4 Datasheet(PDF) 37 Page - Lattice Semiconductor

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