AS4C64M32MD2-25BCN datasheet(72/129 Pages) ALSC

72 / 129 page

Reading

Read

Select Column, and start new read burst

Reading

10,11

Write

Select Column, and start write burst

Writing

10,11,12

BST

Read burst terminate

Active

Writing

Write

Select Column, and start write burst

Writing

10,11

Read

Select Column, and start read burst

Reading

10,11,14

BST

Write burst terminate

Active

Power on

Reset

Begin Device Auto-Initialization

Resetting

7,9

Resetting

MRR

Read Value from Mode Register

Resetting MR

Reading

NOTE 1 The table applies when both CKEn-1 and CKEn are HIGH, and after tXSR or tXP has been met if the previous state was Power Down.

NOTE 2 All states and sequences not shown are illegal or reserved.

NOTE 3 Current State Definitions:

Idle: The bank or banks have been precharged, and tRP has been met.

Active: A row in the bank has been activated, and tRCD has been met. No data bursts / accesses and no register accessesare in progress.

Reading: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.

Writing: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.

NOTE 4 The following states must not be interrupted by a command issued to the same bank. NOP commands or allowable commands to the

other bank should be issued on any clock edge occurring during these states. Allowable commands to the other banks are determined by its

current state and Table 16, and according to Table 17.

Precharging: starts with the registration of a Precharge command and ends when tRP is met. Once tRP is met, the bank will

be in the idle state.

Row Activating: starts with registration of an Activate command and ends when tRCD is met. Once tRCD is met, the bank

will be in the ‘Active’ state.

Read with AP Enabled: starts with the registration of the Read command with Auto Precharge enabled and ends when tRP

has been met. Once tRP has been met, the bank will be in the idle state.

Write with AP Enabled: starts with registration of a Write command with Auto Precharge enabled and ends when tRP has

been met. Once tRP is met, the bank will be in the idle state.

NOTE 5 The following states must not be interrupted by any executable command; NOP commands must be applied to each

positive clock edge during these states.

Refreshing (Per Bank): starts with registration of an Refresh (Per Bank) command and ends when tRFCpb is met. Once

tRFCpb is met, the bank will be in an ‘idle’ state.

Refreshing (All Bank): starts with registration of an Refresh (All Bank) command and ends when tRFCab is met. Once

tRFCab is met, the device will be in an ‘all banks idle’ state.

Idle MR Reading: starts with the registration of a MRR command and ends when tMRR has been met. Once tMRR has been

met, the bank will be in the Idle state.

Resetting MR Reading: starts with the registration of a MRR command and ends when tMRR has been met. Once tMRR has

been met, the bank will be in the Resetting state.

Active MR Reading: starts with the registration of a MRR command and ends when tMRR has been met. Once tMRR has

been met, the bank will be in the Active state.

MR Writing: starts with the registration of a MRW command and ends when tMRW has been met. Once tMRW has been

met, the bank will be in the Idle state.

Precharging All: starts with the registration of a Precharge-All command and ends when tRP is met. Once tRP is met, the

bank will be in the idle state.

NOTE 6 Bank-specific; requires that the bank is idle and no bursts are in progress.

NOTE 7 Not bank-specific; requires that all banks are idle and no bursts are in progress.

NOTE 8 Not bank-specific reset command is achieved through Mode Register Write command.

NOTE 9 This command may or may not be bank specific. If all banks are being precharged, they must be in a valid state for

precharging.

NOTE 10 A command other than NOP should not be issued to the same bank while a Read or Write burst with Auto Precharge is

enabled.

NOTE 11 The new Read or Write command could be Auto Precharge enabled or Auto Precharge disabled.

NOTE 12 A Write command may be applied after the completion of the Read burst; otherwise, a BST must be used to end the

Read prior to asserting a Write command.

NOTE 13 Not bank-specific. Burst Terminate (BST) command affects the most recent read/write burst started by the most recent

Read/Write command, regardless of bank.

NOTE 14 A Read command may be applied after the completion of the Write burst; otherwise, a BST must be used to end the

Write prior to asserting a Read command.

NOTE 15 If a Precharge command is issued to a bank in the Idle state, tRP shall still apply

AS4C64M32MD2-25BCN

AS4C128M16MD2-25BCN

Confidential

- 72/129 -

Rev.1.0 July 2016

AS4C64M32MD2-25BCN Datasheet(PDF) 72 Page - Alliance Semiconductor Corporation

AS4C64M32MD2-25BCN Datasheet(HTML) 72 Page - Alliance Semiconductor Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL