tc59lm818dmgi-37 TOSHIBA Semiconductor CORPORATION, tc59lm818dmgi-37 Datasheet - Page 50

• Manufacturer Part Number: tc59lm818dmgi-37
• Description: 288mbits Network Fcram2 I-version
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Mode Register Set (1st command + 2nd command = RDA + MRS)
Mode Register. In a point to notice, the read mode started with the RDA command is canceled by the MRS
command having gone into the next clock of the RDA command instead of the LAL command. The data to be set in
the Mode Register is transferred using A0 to A14, BA0 and BA1 address inputs. The TC59LM818DMBI have two
mode registers. These are Regular and Extended Mode Register. The Regular or Extended Mode Register is chosen
by BA0 and BA1 in the MRS command. The Regular Mode Register designates the operation mode for a read or
write cycle. The Regular Mode Register has four function fields.
The four fields are as follows:
The Extended Mode Register has three function fields.
set up again by another MRS command or power supply is lost. The initial value of the Regular or Extended Mode
Register after power-up is undefined, therefore the Mode Register Set command must be issued before proper
operation.
•
Regular Mode Register Fields
When all banks are in the idle state, issuing the MRS command following to the RDA command can program the
Once those fields in the Mode Register are set up, the register contents are maintained until the Mode Register is
(R-1) Burst Length field to set the length of burst data
(R-2) Burst Type field to designate the lower address access sequence in a burst cycle
(R-3) CAS Latency field to set the access time in clock cycle
(R-4) Test Mode field to use for supplier only.
The three fields are as follows:
(E-1) DLL Switch field to choose either DLL enable or DLL disable
(E-2) Output Driver Impedance Control field.
(E-3) Data Strobe Select
Regular Mode Register/Extended Mode Register change bits (BA0, BA1)
(R-1) Burst Length field (A2 to A0)
(R-2) Burst Type field (A3)
These bits are used to choose either Regular MRS or Extended MRS
This field specifies the data length for column access using the A2 to A0 pins and sets the Burst Length
to be 2 or 4 words.
The Burst Type can be chosen Interleave mode or Sequential mode. When the A3 bit is “0”, Sequential
mode is selected. When the A3 bit is “1”, Interleave mode is selected. Both burst types support burst
length of 2 and 4 words.
A2
0
0
0
0
1
BA1
0
0
1
A1
A3
0
0
1
1
×
0
1
BA0
0
1
×
A0
0
1
0
1
×
BURST TYPE
Sequential
Interleave
Mode Register Set
Extended MRS
Regular MRS
Reserved
BURST LENGTH
Reserved
Reserved
Reserved
2 words
4 words
TC59LM818DMGI-37
2005-11-08 50/55
Rev 1.2