Document Outline

• Features/Options
• 16Mb (x4/x8) SDRAM Part Numbers
• Key Timing Parameters
• 44-Pin TSOP Pin Assignment
• General Description
• Table of Contents
• Functional Block Diagram, 4 Meg x 4 SDRAM
• Functional Block Diagram, 2 Meg x 8 SDRAM
• Pin Descriptions
• Functional Description
  • Initialization
  • Register Definition
    • Mode Register
      • Burst Length
      • Burst Type
      • Figure 1, Mode Register Definition
      • Table 1, Burst Definition
      • CAS Latency
      • Operating Mode
      • Write Burst Mode
      • Figure 2, CAS LATENCY
      • Table 2, CAS LATENCY
• Commands
  • Truth Table 1 - Commands and DQM Operation
  • Command Inhibit
  • NO OPERATION (NOP)
  • LOAD MODE REGISTER
  • ACTIVE
  • READ
  • WRITE
  • PRECHARGE
  • Auto Precharge
  • BURST TERMINATE
  • AUTO REFRESH
  • SELF REFRESH
• Operation
  • Bank/Row Activation
  • Figure 3, Activating a Specific Row in a Specific Bank
  • Example: Meeting tRCD (MIN) When 2 < tRCD (MIN)/tCK < 3
  • READs
  • Figure 5, READ Command
  • Figure 6, CAS Latency
  • Figure 7, Consecutive READ Bursts
  • Figure 8, Random READ Accesses
  • Figure 9, READ to WRITE
  • Figure 10, READ to WRITE with Extra Clock Cycle
  • Figure 11, READ to PRECHARGE
  • Figure 12, Terminating a READ Burst
  • WRITEs
  • Figure 13, WRITE Command
  • Figure 14, WRITE Burst
  • Figure 15, WRITE to WRITE
  • Figure 16, RANDOM WRITE Cycles
  • Figure 17, WRITE to READ
  • Figure 18, WRITE to PRECHARGE
  • Figure 19, Terminating a WRITE Burst
  • Figure 20, PRECHARGE Command
  • PRECHARGE
  • Power-Down
  • Figure 21, Power-Down
  • Clock Suspend Mode
  • Figure 22, CLOCK SUSPEND During WRITE Burst
  • Burst Read/Single Write
  • Figure 23, CLOCK SUSPEND During READ Burst
  • CONCURRENT AUTO PRECHARGE
  • Figure 24, READ with Auto Precharge Interrupted by a READ
  • Figure 25, READ with Auto Precharge Interrupted by a WRITE
  • Figure 26, WRITE with Auto Precharge Interrupted by a READ
  • Figure 27, WRITE with Auto Precharge Interrupted by a WRITE
  • Truth Table 2 - CKE
  • Truth Table 3 - Current State Bank n - Command to Bank n
  • Truth Table 4 - Current State Bank n - Command to Bank m
• Absolute Maximum Ratings
• DC Electrical Characteristics and Operating Conditions
• Icc Specifications and Conditions
• Capacitance
• Electrical Characteristics and Recommended AC Operating Conditions
• AC Functional Characteristics
• Electrical Timing Characteristics Between -8 Speed Options
• Notes
• Timing Diagrams
  • Initialize and Load Mode Register
  • Power-Down Mode
  • Clock Suspend Mode
  • Auto Refresh Mode
  • Self Refresh Mode
  • READ � Without AutoPrecharge
  • READ � With AutoPrecharge
  • Alternating Bank READ Accesses
  • READ � Full-Page Burst
  • READ � DQM Operation
  • WRITE � Without AutoPrecharge
  • WRITE � With AutoPrecharge
  • Alternating Bank WRITE Accesses
  • WRITE � Full-Page Burst
  • WRITE � DQM Operation
• 44-Pin Plastic TSOP (400 mil) Package Drawing