CYNSE70032
Document #: 38-02042 Rev. *E
Page 12 of 126
OE_L
T
SRAM Output Enable. This is the output-enable control for external SRAMs. Only the
last device drives this signal (with the LRAM bit set).
ALE_L
T
Address Latch Enable. When this signal is low, the addresses are valid on the SRAM
address bus. In a database of multiple CYNSE70032s, the ALE_L of all cascaded devices
must be connected. This signal is then driven by only one of the devices.
Cascade Interface
LHI[6:0]
I
Local Hit In. These pins depth cascade the device to form a larger table. One signal of
this bus is connected to the LHO[1] or LHO[0] of each of the upstream devices in a block.
All unused LHI pins are connected to a logic 0. (For more information, see Section 14.0,
“Depth-Cascading” on page 96.)
LHO[1:0]
O
Local Hit Out. LHO[1] and LHO[0] are the same logical signal. Either the LHO[1] or the
LHO[0] is connected to one input of the LHI bus of up to four downstream devices in a
block of up to eight. (For more information see Section 14.0, “Depth-Cascading” on
page 96.)
BHI[2:0]
I
Block Hit In. Inputs from the previous block BHO[2:0] are tied to the BHI[2:0] of the current
device. In a four-block system, the last block can contain only seven devices because the
identification code 11111 is used for broadcast access.
BHO[2:0]
O
Block Hit Out. These outputs from the last device in a block are connected to the BHI[2:0]
inputs of the devices in the downstream blocks.
FULI[6:0]
I
Full In. Each signal in this bus is connected to FULO[0] or FULO[1] of an upstream device
to generate the FULL flag for the depth-cascaded block.
FULO[1:0]
O
Full Out. FULO[1] and FULO[0] are the same logical signal. One of these two signals
must be connected to the FULI of up to four downstream devices in a depth-cascaded
table. Bit[0] in the data array indicates whether the entry is full (1) or empty (0).This signal
is asserted if all bits in the data array are 1s. (Refer to Section 14.0, “Depth-Cascading”
on page 96, for information on how to generate the FULL flag.)
FULL
O
Full Flag. When asserted, this signal indicates that the table of multiple depth-cascaded
devices is full.
Device Identification
ID[4:0]
I
Device Identification. The binary-encoded device identification for a depth-cascaded
system starts at 00000 and goes up to 11110. 11111 is reserved for a special broadcast
address that selects all cascaded search engines in the system. On a broadcast
Read-only, the device with the LDEV bit set to 1 responds.
Supplies
VDD
n/a
Chip Core Supply. 1.8V.
VDDQ
n/a
Chip I/O Supply. 2.5V or 3.3V.
Test Access Port
TDI
I
Test Access Port’s Test Data In.
TCK
I
Test Access Port’s Test Clock.
TDO
T
Test Access Port’s Test Data Out.
TMS
I
Test Access Port’s Test Mode Select.
TRST_L
I
Test Access Port’s Reset.
Table 5-1. CYNSE70032 Signal Description (continued)
Parameter
Type[1]
Description
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