CYF1018V, CYF1036V
CYF1072V
18/36/72-Mbit Programmable
2-Queue FIFOs
18/36/72-Mbit Programmable 2-Queue FIFOs
Features
■ Memory organization
❐ Industry’s largest first in first out (FIFO) memory densities:
18-Mbit, 36-Mbit, 72-Mbit
❐ Selectable memory organization: × 9, × 12, × 16, × 18, × 20,
× 24, × 32, × 36
■ Up to 100-MHz clock operation
■ Unidirectional operation
■ Independent read and write ports
❐ Supports simultaneous read and write operations
❐ Reads and writes operate on independent clocks upto a
maximum clock ratio of 2, enabling data buffering across
clock domains
❐ Supports multiple I/O voltage standard: Low voltage
complementary metal oxide semiconductor (LVCMOS) 3.3 V
and 1.8 V voltage standards.
■ output enable control for read skip operations
■ User configured two-Queue operating mode
■ Mark and retransmit: resets read pointer to user marked
position
■ Empty and full status flags
■ Flow-through mailbox register to send data from input to output
port, bypassing the FIFO sequence
■ Configure programmable flags and registers through serial or
parallel modes
■ Separate serial clock (SCLK) input for serial programming
■ Master reset to clear entire FIFO
■ Joint test action group (JTAG) port provided for boundary scan
function
■ Industrial temperature range: –40 °C to +85 °C
Functional Description
The Cypress programmable FIFO family offers the industry’s
highest-density programmable FIFO memory device. It has
independent read and write ports, which can be clocked up to
100 MHz. User can configure input and output bus sizes. The
maximum bus size of 36 bits enables a maximum data
throughput of 3.6 Gbps. The read and write ports can support
multiple I/O voltage standards. The user-programmable
registers enable user to configure the device operation as
desired. The device also offers a simple and easy-to-use
interface to reduce implementation and debugging efforts,
improve time-to-market, and reduce engineering costs. This
makes it an ideal memory choice for a wide range of applications
including multiprocessor interfaces, video and image
processing, networking and telecommunications, high-speed
data acquisition, or any system that needs buffering at very high
speeds across different domains.
As implied by the name, the functionality of the FIFO is such that
the data is read out of the read port in the same sequence in
which it was written into the write port. The data is sequentially
written into the FIFO from the write port. If the writes and inputs
are enabled, the data on the write port gets written into the device
at the rising edge of the write clock. Enabling the reads and
outputs fetches data on the read port at every rising edge of the
read clock. Both reads and writes can occur simultaneously at
different speeds provided the ratio of read to write clock is
between 0.5 and 2. Appropriate flags are set whenever the FIFO
is empty or full.
The device also supports two-Queue operation, mark and
retransmit of data, and a flow-through mailbox register.
All product features and specs are common to all densities
(CYF1072V, CYF1036V, and CYF1018V) unless otherwise
specified. All descriptions are given assuming the device is
CYF1072V operated in × 36 mode. They hold good for other
densities (CYF1036V, and CYF1018V) and all port sizes × 9,
×12, × 16, × 18, × 20, × 24 and × 32 unless otherwise specified.
the only difference will be in the input and output bus width.
Table 1 on page 8 shows the part of bus with valid data from
D[35:0] and Q[35:0] in × 9, × 12, × 16, × 18, × 20, × 24, × 32 and
× 36 modes.
Cypress Semiconductor Corporation • 198 Champion Court
wwwD.DocautamSheenett4NUu.nmebt er: 001-68321 Rev. **
• San Jose, CA 95134-1709 • 408-943-2600
Revised April 12, 2011
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