CYNSE70064A-66BGC Cypress Semiconductor Corp, CYNSE70064A-66BGC Datasheet - Page 76

• Manufacturer Part Number: CYNSE70064A-66BGC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYNSE70064A-66BGC

• Operating Supply Voltage (typ): 1.8V
• Operating Supply Voltage (min): 1.7V
• Operating Supply Voltage (max): 1.9V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Package Type: BGA
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Not Compliant

The following is the sequence of operation for a single 272-bit Search command (also See “Commands and Command Param-
eters” on page 19.).
Note. For 272-bit searches, the host ASIC must supply four distinct 68-bit data words on DQ[67:0] during cycles A, B, C, and D.
The GMR index in cycle A selects a pair of GMRs in each of the eight devices that apply to DQ data in cycles A and B. The GMR
index in cycle C selects a pair of GMRs in each of the eight devices that apply to DQ data in cycles C and D.
The logical 272-bit Search operation is shown in Figure 10-56. The entire table of 272-bit entries is compared to a 272-bit word
K that is presented on the DQ bus in cycles A, B, C, and D of the command using the GMR and the local mask bits. The GMR is
the 272-bit word specified by the two pairs of GMRs selected by the GMR Indexes in the command’s cycles A and C in each of
the eight devices. The 272-bit word K that is presented on the DQ bus in cycles A, B, C, and D of the command is compared to
Document #: 38-02041 Rev. *F
CFG = 10101010, HLAT = 000, TLSZ = 01, LRAM = 1, LDEV = 1.
Note: |(LHI[6:0]) stands for the boolean ‘OR’ of the entire bus LHI[6:0].
Note: Each bit in LHO[1:0] is the same logical signal.
• Cycle A: The host ASIC drives the CMDV HIGH and applies Search command code (10) on CMD[1:0] signals. CMD[5:3]
• Cycle B: The host ASIC continues to drive the CMDV HIGH and applies Search command code (10) on CMD[1:0]. The
• Cycle C: The host ASIC drives the CMDV HIGH and applies Search command code (10) on CMD[1:0] signals. CMD[5:3]
• Cycle D: The host ASIC continues to drive the CMDV HIGH and applies Search command code (10) on CMD[1:0]. CMD[8:6]
signals must be driven with the index to the GMR pair used for bits [271:136] of the data being searched in this operation.
DQ[67:0] must be driven with the 68-bit data ([271:204]) to be compared against all locations 0 in the four-word 68-bit page.
The CMD[2] signal must be driven to logic 1. Note. CMD[2] = 1 signals that the Search is a ×272 bit Search. CMD[8:3] in this
cycle is ignored.
DQ[67:0] is driven with the 68-bit data ([203:136]) to be compared against all locations 1 in the four 68-bits-word page.
signals must be driven with the index to the GMR pair used for bits [135:0] of the data being searched. CMD[8:7] signals must
be driven with the bits that will be driven on SADR[21:20] by this device if it has a hit. DQ[67:0] must be driven with the 68-bit
data ([135:68]) to be compared against all locations 2 in the four 68-bits-word page. The CMD[2] signal must be driven to logic 0.
signals must be driven with the index of the SSR that will be used for storing the address of the matching entry and the hit flag
(see page 14 for the description of SSR[0:7]). The DQ[67:0] is driven with the 68-bit data ([67:0]) to be compared to all locations 3
in the four 68-bits-word page. CMD[5:2] is ignored because the Learn instruction is not supported for x272 tables.
SADR[21:0]
CMD[2]
CMD[8:2]
CMD[1:0]
PHS_L
LHO[1:0]
|(LHI[6:0])
CMDV
CLK2X
ALE_L
Figure 10-55. Timing Diagram for 272-bit Search Device Number 7 (Last Device)
OE_L
CE_L
WE_L
SSF
SSV
DQ
0
0
0
1
0
0
cycle
A B A B A B A B
A B C D A B C D
1
Search1
cycle
01
D1
2
cycle
3
Search2
D2
cycle
01
4
cycle
A B A B
A B C D
5
Search3
D3
cycle
01
6
1
cycle
Search1
(Miss
on this
device.)
7
z
z
z
z
z
cycle
8
0
0
Search2 Search3
(Miss
on this
device.)
cycle
9
z
z
z
z
z
cycle
10
1
0
0
0
0
(Global
miss.)
CYNSE70064A
1
0
Page 76 of 128